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Crystals
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Advances in Organic Semiconductors
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Advances in Organic Semiconductors

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Organic Crystalline Materials".

Deadline for manuscript submissions: closed (14 March 2025) | Viewed by 3893

Special Issue Editor

Dr. Youngjun Yun

E-Mail Website
Guest Editor
School of Nano Convergence Technology, Hallym University, Chuncheon-si, Republic of Korea
Interests: small organic molecules/polymeric semiconductors; flexible/stretchable semiconductors; device physics; opto-electronic devices; molecular doping
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Organic semiconductors were identified in the late 1940s, and semiconductors, which are based on small organic molecules and conjugated polymers, have been intensely investigated since the late 1980s.  The performance of organic semiconductors has improved continuously over the last 30 years, and OLEDs (organic light-emitting diodes) have now successfully launched on the display market. They possess two key advantages over devices fabricated from inorganic semiconductors: mechanical flexibility and stretchability, and low manufacturing costs. This Special Issue, "Advances in Organic Semiconductors", will cover the state of the art and key challenges in the field of organic semiconductors, with a particular focus on molecular structure; design and synthesis; novel device physics; and molecular doping for mechanical flexibility/stretchability and photo-related applications.

Dr. Youngjun Yun
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2100 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • small organic molecules/polymeric semiconductors
  • flexible/stretchable semiconductors
  • device physics
  • opto-electronic devices
  • molecular doping

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Published Papers (2 papers)

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Research

12 pages, 4828 KiB  
Article
Structural and Optical Characterization of a New Tetra- and Hexa-Coordinated Cd-Based Hybrid Compound with White Light Emission
by Imen Sayer, Rawia Msalmi, Edoardo Mosconi, Ahlem Guesmi, Ammar Houas, Naoufel Ben Hamadi and Houcine Naïli
Crystals 2024, 14(5), 459; https://doi.org/10.3390/cryst14050459 - 12 May 2024
Cited by 1 | Viewed by 1675
Abstract
The present paper deals with a new two-in-one zero-dimensional (0D) organic–inorganic hybrid compound namely (C6H10N2)4[CdBr6][CdBr4]2. This molecular crystal structure contains isolated CdBr4 tetrahedra and CdBr6 octahedra. The [...] Read more.
The present paper deals with a new two-in-one zero-dimensional (0D) organic–inorganic hybrid compound namely (C6H10N2)4[CdBr6][CdBr4]2. This molecular crystal structure contains isolated CdBr4 tetrahedra and CdBr6 octahedra. The optical characterization by UV–Vis–NIR spectroscopy shows that the (C6H10N2)4[CdBr6][CdBr4]2 exhibits a large gap energy of 4.97 eV. Under UV excitation, this hybrid material shows a bright cold white light emission (WLE) at room temperature. The photoluminescence (PL) analysis suggests that the WLE originates from the organic molecules. Density of states (DOS) analysis using the density functional theory (DFT) demonstrates that the calculated HOMO(Br)→LUMO(organic) absorption transition (4.1 eV) does not have significant intensity, while, the transition involving the valence band (VB) and the second and third conduction bands (CB) around 5 eV are allowed, which is in good agreement with the experimental gap value. The interesting theoretical result is that the LUMO(organic)→HOMO(Br) emission is allowed, which confirms the important role of the organic molecule in the emission mechanism, in good agreement with the experimental PL analysis. Full article
(This article belongs to the Special Issue Advances in Organic Semiconductors)
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10 pages, 2253 KiB  
Article
Effects of Conjugation Spacers in Diketopyrrolopyrrole-Based Copolymers for All-Polymer-Based Photodiodes
by Hyunbum Kang, Hyungjun Kim, Ajeong Choi, Youngjun Yun and Gae Hwang Lee
Crystals 2023, 13(10), 1454; https://doi.org/10.3390/cryst13101454 - 29 Sep 2023
Viewed by 1589
Abstract
The selection of the π-conjugation spacers in semi-conducting polymer backbone is one of the important factors for determining the optoelectrical and morphological properties in organic photodiodes. To study the effects of π-conjugation spacers in donor–acceptor (D-A)-type alternating copolymers on their device performances in [...] Read more.
The selection of the π-conjugation spacers in semi-conducting polymer backbone is one of the important factors for determining the optoelectrical and morphological properties in organic photodiodes. To study the effects of π-conjugation spacers in donor–acceptor (D-A)-type alternating copolymers on their device performances in all-polymer-based photodiodes (all-PPDs), a series of diketopyrrolopyrrole (DPP)-based copolymers as polymer donors (PDs) were designed and synthesized. In detail, three different π-conjugation spacers, thiophene (T for P1), thienothiophene (TT for P2), and bithiophene (BT for P3), were incorporated into the DPP-based copolymer structures. Interestingly, all-PPDs based on the series of P1–P3 as PDs and N2200 as a polymer acceptor (PA) exhibited totally distinct device performances in terms of external quantum efficiency (EQE), dark current density (JD), and ideal detectivity (D*). The P1-based device showed suppressed JD (6.1 × 10−11 A/cm2 at −1 V) compared to those of the P2- and P3-based devices due to the lower lying of the highest occupied molecular orbital (HOMO) level of P1. However, the P3-based all-PPD showed higher EQE (16% at 630 nm wavelength and −1 V) compared to those of the P1- and P2-based devices. And, it mainly originated from the better molecular packing and final blend film morphology, as confirmed by morphological analyses. Full article
(This article belongs to the Special Issue Advances in Organic Semiconductors)
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