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Polymers 2017, 9(8), 352; https://doi.org/10.3390/polym9080352

Long Lived Photoexcitation Dynamics in π-Conjugated Polymer/PbS Quantum Dot Blended Films for Photovoltaic Application

School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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Received: 3 July 2017 / Revised: 26 July 2017 / Accepted: 9 August 2017 / Published: 10 August 2017
(This article belongs to the Special Issue Polymeric Materials for Optical Applications)
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Abstract

We used continuous wave photoinduced absorption (PIA) spectroscopy to investigate long-lived polarons in a blend of PbS quantum dot and regio-regular poly (3-hexylthiophene) (RR-P3HT). The charge transfer from RR-P3HT to PbS as well as from PbS to RR-P3HT were observed after changing the capping ligand of PbS from a long chain molecular to a short one. Therefore, PbS could be used to extend the working spectral range in hybrid solar cells with a proper capping ligand. However, we found that the recombination mechanism in the millisecond time region is dominated by the trap/defects in blended films, while it improves to a bimolecular recombination partially after ligand exchange. Our results suggest that passivating traps of nanocrystals by improving surface ligands will be crucial for relevant solar cell applications. View Full-Text
Keywords: photoinduced absorption spectroscopy; organic inorganic hybrid materials; solar energy photoinduced absorption spectroscopy; organic inorganic hybrid materials; solar energy
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Wang, R.; Yan, X.; Yang, X.; Wang, Y.; Li, H.; Sheng, C. Long Lived Photoexcitation Dynamics in π-Conjugated Polymer/PbS Quantum Dot Blended Films for Photovoltaic Application. Polymers 2017, 9, 352.

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