Phase State Influence on Photoluminescence of MAPb(Br_xI_1−x)₃ Perovskites towards Optimized Photonics Applications

Round 1

Reviewer 1 Report

This manuscript has done a lot of work, including theory and testing, and the results are convincing. It is an interesting article. However, the writing level of manuscript has obviously reached the published level. Herein，I put forward some suggestions, hoping that the author can seriously revise the paper.

1、 Superscript and subscript. All superscripts and subscripts in the manuscript must be corrected, including references, which are suggested to be edited with software such as endnote.

2、 In the introduction section, the author introduces too much literature work, and suggests to reduce it appropriately. In the last paragraph of introduction, when introducing your work, authors can add some relevant content.

3、 I don't quite understand what the author is trying to say in lines 82 to 88 on page 2, Please check.

4、 At line 108 on page 3, can the quantity of PbI₂ and MA be expressed in molar quantity at the same time?

5、 Whether the chemical formula is reasonable?

6、 At line 181 on page 6, A comma should be added after 29.42°. Pay attention to the use of English punctuation marks. Please check the whole manuscript

7、 At line 259, “as shown in Figure.4” will be better.

8、 Whether the quantum yield and lifetime have been tested?

Author Response

Manuscript Number: photonics-2007551

“Phase State Influence on Photoluminescence of MAPb(Br_xI_1-x)₃ Perovskites Towards Optimized Photonics Applications”

by Huda Bawazir and et al.

Responses to Reviewer #1:

This manuscript has done a lot of work, including theory and testing, and the results are convincing. It is an interesting article. However, the writing level of manuscript has obviously reached the published level. Here in I put forward some suggestions, hoping that the author can seriously revise the paper.

We would like to thank the reviewer for his time and review of our manuscript, and for his helpful remarks. In the revised version, all additions and correction were highlighted in green color. Our responses to the comments are as follows:

 

1. Superscript and subscript. All superscripts and subscripts in the manuscript must be corrected, including references, which are suggested to be edited with software such as endnote.

Thank you for your comments. The software that uses here to arrange the references is Mendeley. All the errors indicated have been corrected in all sides of the manuscript. 

2. In the introduction section, the author introduces too much literature work, and suggests to reduce it appropriately. In the last paragraph of introduction, when introducing your work, authors can add some relevant content.

Thank you for your note, the introduction section has been modified according to your comments.

3. I don't quite understand what the author is trying to say in lines 82 to 88 on page 2, Please check.

We apologize for the mistake; we did not consider removing the materials part from the template.

4. At line 108 on page 3, can the quantity of PbI₂and MA be expressed in molar quantity at the same time?

The required addition has been made.

5. Whether the chemical formula is reasonable?

               We apologize for the mistake; the chemical formula is corrected.

6. At line 181 on page 6, A comma should be added after 29.42°. Pay attention to the use of English punctuation marks. Please check the whole manuscript

The required addition has been made. Also, the manuscript has been revised.

7. At line 259, “as shown in Figure.4” will be better.

I agree with you.

8. Whether the quantum yield and lifetime have been tested?

They were not measured directly, but we made a comparison by changing the PL intensity with different conditions.

Reviewer 2 Report

In this paper, authors have investigated the photoluminescence of different MAPb(Br_xI_1-x)₃ perovskites based on the relative weightage of Br and I and studied their behaviour at different temperatures. In addition, the phase transition property has been investigated with the change in temperature. A detailed description of the fabrication, characterization and materials has been provided in the manuscript. However, there are several concerns that authors should address before it can be considered for publication.    

The state-of-the-art of perovskite solar cells should be improved, highlighting the main applications, as Space (e.g.Solar energy in space applications: review and technology perspectives. Advanced Energy Materials, 12(29), 2200125, 2022)

1.      In the text authors mentioned about figure 7b, which is apparently missing in the manuscript.

2.      Nothing can be understood from Figure 7, too many graphs. Why the figure plotted for x=50?

3.      The discussion about the phase transition with temperature should be properly organized. It seems scattered in the text. What are the transitions, how they are they identified and how does it change with the relative weightage of Br and I. An elaboration is needed.

4.      Figure 5 should be modified. I recommend to add double x-axis with top one as wavelength and bottom one in ‘ev’. A dotted line should be added with each graph, pointing to the bottom x-axis cut, which can be helpful in visualizing the change of bandwidth with different x in MAPb(Br_xI_1-x)₃.

5.      Authors have claimed that with the change in temperature, the behaviour of bandwidth is unusual. Authors should provide a graph or a table in support of this.  

6.      What are the potential fields this study can be applicable? A detailed description towards the end is required.  

7.      There are a lot of errors throughout the text. Few I am mentioning below. I strongly recommend the authors to go through the manuscript properly and rectify all such errors.

§  When an abbreviation is used for the first time in the text it should be defined. For example, ‘PL’ in the abstract.

§  Page No.2, line No. 82 to 87 should be removed. It looks authors have forgotten to remove article guidelines from the manuscript. 

§  There are lot of spelling mistakes throughout the manuscript. Page No.4, line No.161, it should be ‘could’ not ‘cold’, page No.6, Line. No.186, it should be ‘tabulated’ not ‘tableted’, page. No. 7, Line. No. 215, there should be 3 in the subscript, etc.

§  In page. No.3, Line. No. 131, the unit (3^o/min^-1) seems to be wrong. Also, the unit of ‘theta’ in table.1 is wrong.

§  In figures and tables authors should use the symbol for ‘theta’ as they did in the text. 

Author Response

Manuscript Number: photonics-2007551

“Phase State Influence on Photoluminescence of MAPb(Br_xI_1-x)₃ Perovskites Towards Optimized Photonics Applications”

by Huda Bawazir and et al.

Responses to Reviewer #2:

In this paper, authors have investigated the photoluminescence of different MAPb(Br_xI_1-x)₃ perovskites based on the relative weightage of Br and I and studied their behavior at different temperatures. In addition, the phase transition property has been investigated with the change in temperature. A detailed description of the fabrication, characterization and materials has been provided in the manuscript. However, there are several concerns that authors should address before it can be considered for publication.    

The state-of-the-art of perovskite solar cells should be improved, highlighting the main applications, as Space (e.g. Solar energy in space applications: review and technology perspectives. Advanced Energy Materials, 12(29), 2200125, 2022)

We would like to thank the reviewer for his time and review of our manuscript, and for his helpful remarks. We have made the addition required by you as was referred to the reference above in the context of talking about the applications of these materials, thank you very much again. In the revised version, all additions and correction were highlighted in green color. Our responses to the comments are as follows:

1. In the text authors mentioned about figure 7b, which is apparently missing in the manuscript.

We apologize for the mistake, there was a figure, but it was removed, and modified in the manuscript.

2. Nothing can be understood from Figure 7, too many graphs. Why the figure plotted for x=50?

            Thank you for noticing the figure 7 has been modified. A result was chosen only for one of the samples due to the similarity of the general behavior of all five samples in terms of changing the intensity and FWHM with temperature, where the relation of wavelength with temperature is shown in the figure 8.

3. The discussion about the phase transition with temperature should be properly organized. It seems scattered in the text. What are the transitions, how they are they identified and how does it change with the relative weightage of Br and I. An elaboration is needed.

The section about the discussion about the phase transition is totally revised.

4. Figure 5 should be modified. I recommend to add double x-axis with top one as wavelength and bottom one in ‘ev’. A dotted line should be added with each graph, pointing to the bottom x-axis cut, which can be helpful in visualizing the change of bandwidth with different x in MAPb(Br_xI_1-x)₃.

Figure 5 has been modified according to your remark.

5. Authors have claimed that with the change in temperature, the behaviour of bandwidth is unusual. Authors should provide a graph or a table in support of this.  

We talked about the unusual relation between the emission peak position with the change in temperature, which is shown in figure 8. about PL bandwidth, we mention "about PL peak is narrows as the temperature is lowered" which is normal in semiconductors.

6. What are the potential fields this study can be applicable? A detailed description towards the end is required.  

Thank you for your comment. We added one paragraph before the conclusion to explain the potential fields this study can be applicable.

 

7. There are a lot of errors throughout the text. Few I am mentioning below. I strongly recommend the authors to go through the manuscript properly and rectify all such errors.

• When an abbreviation is used for the first time in the text it should be defined. For example, ‘PL’ in the abstract.
• Page No.2, line No. 82 to 87 should be removed. It looks authors have forgotten to remove article guidelines from the manuscript. 
• There are lot of spelling mistakes throughout the manuscript. Page No.4, line No.161, it should be ‘could’ not ‘cold’, page No.6, Line. No.186, it should be ‘tabulated’ not ‘tableted’, page. No. 7, Line. No. 215, there should be 3 in the subscript, etc.
• In page. No.3, Line. No. 131, the unit (3^o/min^-1) seems to be wrong. Also, the unit of ‘theta’ in table.1 is wrong.
• In figures and tables authors should use the symbol for ‘theta’ as they did in the text. 

We thank the reviewer for his comment. All typos were corrected through the whole manuscript. Moreover, the language was polished and revised.

Reviewer 3 Report

The authors report phase state influence on the photoluminescence of different MAPb(BrxI1-x)3 perovskites, especially the exciton behavior of halide anions, I and Br, which has considerable impacts on structural phases and PL properties. However, too many similar studies have been peroformed to in this filed. This work is too routine and lacks novelty for publication in this form. Besides, the manuscript is poorly written with many grammar erros. For instance, in the abstract:

Line 2:  ->"Photonics applications",  

 -> "One of these challenges being the low thermal stability resulting in phase transitions with temperatures"......

Line 9:  -> "Also, two-phase transitions for MAPb(BrxI1-x)3 samples. at X=0, 0.25 and 0.50 the first transition occurs below room temperature orthorhombic to tetragonal) and the other occurs above room temperature (tetragonal 22 to cubic), increase the proportion of bromine to X = 0.75 and 1.00, leads the second transition occurs 23 down the room temperature. "

...... and so on

Therefore, the present form is not suitable for publication.

Author Response

Manuscript Number: photonics-2007551

“Phase State Influence on Photoluminescence of MAPb(Br_xI_1-x)₃ Perovskites Towards Optimized Photonics Applications”

by Huda Bawazir and et al.

Responses to Reviewer #3:

The authors report phase state influence on the photoluminescence of different MAPb(Br_xI_1-x)₃ perovskites, especially the exciton behavior of halide anions, I and Br, which has considerable impacts on structural phases and PL properties.

We thank the reviewers for the valuable comments and suggestions. In the revised version, all additions and correction were highlighted in green color. Our responses to the comments are as follows:

 However, too many similar studies have been peroformed to in this filed.

Response:

We thank the reviewer for his attitude toward our results, and we thank him also for his valuable comments and suggestions. As mentioned in the manuscript, mainly, in this work, parameter verification, optimization, and modification with temperature are one of the basics to learn how to exploit the advantages of the material in different applications. This paper gives an overview of MAPb(Br_xI_1-x)₃ expansion of the band gap and the change of activation energy with the change of the anion ratio between (Br, I), which helps in understanding more in halide perovskite and future development in this field. The method of preparation through the thermal evaporation process gives high-quality nanocrystal films, without any difficulties in preparation and without the need for any solvent, which facilitates their manufacture for applications. Determining the type and percentage of the anion (x) helps to expand the range of absorption and emission spectra, thus giving better efficiency in using it, for example, as sensors in solar cells, with low-energy consumption, use as active layers in photodetectors (highly efficient and sensitive to polarization) by taking advantage of the large absorption coefficients of perovskite that are controlled by the type and ratio of the anion. And according to our best knowledge, the novelty comes from the lake reports on studying the effect of parameter verification, optimization, and modification with temperature with a high-quality film that preparation by a high-quality method (thermal evaporation). However, your comments have been taken into consideration, and here are some specific additions regarding your comments, to improve the manuscript.

*********************************************************************

This work is too routine and lacks novelty for publication in this form.

Response: 

We thank the reviewer for his attitude toward our results, and we thank him also for his valuable comments and suggestions. As mentioned in the manuscript, mainly, in this work, we investigated the optical response of perovskite film and phase transition by different temperatures through the study of the PL behavior.  The results were described and treated correctly. However, your comments have been taken into consideration. So, one paragraph was added before the conclusion.

*********************************************************************

Besides, the manuscript is poorly written with many grammar erros. For instance, in the abstract:

Line 2:  ->"Photonics applications",  

 -> "One of these challenges being the low thermal stability resulting in phase transitions with temperatures"......

Line 9:  -> "Also, two-phase transitions for MAPb(BrxI1-x)3 samples. at X=0, 0.25 and 0.50 the first transition occurs below room temperature orthorhombic to tetragonal) and the other occurs above room temperature (tetragonal 22 to cubic), increase the proportion of bromine to X = 0.75 and 1.00, leads the second transition occurs 23 down the room temperature. "

...... and so on

Therefore, the present form is not suitable for publication.

Response: 

We thank the reviewer for his comment. All typos were corrected throughout the whole manuscript.

Round 2

Reviewer 2 Report

The Authors have modified the manuscript according to the Reviewer suggestions. Therefore, I suggest the manuscript publication.

Reviewer 3 Report

I still persist my initial decision.