Next Article in Journal
Development of Magnetically Active Scaffolds for Bone Regeneration
Previous Article in Journal
Comparison of Fabrication Methods of Metal-Organic Framework Optical Thin Films
Article

Charge Transport in Trap-Sensitized Infrared PbS Quantum-Dot-Based Photoconductors: Pros and Cons

1
UMDO, Instituto de Ciencia de los Materiales, Universidad de Valencia, P.O. Box 22085, 46071 Valencia Spain
2
Intenanomat SL, Catedrático José Beltrán 2, 46980 Paterna, Spain
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(9), 677; https://doi.org/10.3390/nano8090677
Received: 2 August 2018 / Revised: 23 August 2018 / Accepted: 28 August 2018 / Published: 30 August 2018
Control of quantum-dot (QD) surface chemistry offers a direct approach for the tuning of charge-carrier dynamics in photoconductors based on strongly coupled QD solids. We investigate the effects of altering the surface chemistry of PbS QDs in such QD solids via ligand exchange using 3-mercaptopropionic acid (MPA) and tetrabutylammonium iodide (TBAI). The roll-to-roll compatible doctor-blade technique was used for the fabrication of the QD solid films as the photoactive component in photoconductors and field-effect phototransistors. The ligand exchange of the QD solid film with MPA yields superior device performance with higher photosensitivity and detectivity, which is due to less dark current and lower noise level as compared to ligand exchange with TBAI. In both cases, the mechanism responsible for photoconductivity is related to trap sensitization of the QD solid, in which traps are responsible of high photoconductive gain values, but slow response times under very low incident optical power (<1 pW). At medium–high incident optical powers (>100 pW), where traps are filled, both MPA- and TBAI-treated photodevices exhibit similar behavior, characterized by lower responsivity and faster response time, as limited by the mobility in the QD solid. View Full-Text
Keywords: PbS quantum dots; quantum dot solid; ligand exchange; solution processing; doctor blade; PbS QD photoconductivity; PbS QD photodetectors PbS quantum dots; quantum dot solid; ligand exchange; solution processing; doctor blade; PbS QD photoconductivity; PbS QD photodetectors
Show Figures

Figure 1

MDPI and ACS Style

Maulu, A.; Navarro-Arenas, J.; Rodríguez-Cantó, P.J.; Sánchez-Royo, J.F.; Abargues, R.; Suárez, I.; Martínez-Pastor, J.P. Charge Transport in Trap-Sensitized Infrared PbS Quantum-Dot-Based Photoconductors: Pros and Cons. Nanomaterials 2018, 8, 677. https://doi.org/10.3390/nano8090677

AMA Style

Maulu A, Navarro-Arenas J, Rodríguez-Cantó PJ, Sánchez-Royo JF, Abargues R, Suárez I, Martínez-Pastor JP. Charge Transport in Trap-Sensitized Infrared PbS Quantum-Dot-Based Photoconductors: Pros and Cons. Nanomaterials. 2018; 8(9):677. https://doi.org/10.3390/nano8090677

Chicago/Turabian Style

Maulu, Alberto, Juan Navarro-Arenas, Pedro J. Rodríguez-Cantó, Juan F. Sánchez-Royo, Rafael Abargues, Isaac Suárez, and Juan P. Martínez-Pastor 2018. "Charge Transport in Trap-Sensitized Infrared PbS Quantum-Dot-Based Photoconductors: Pros and Cons" Nanomaterials 8, no. 9: 677. https://doi.org/10.3390/nano8090677

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop