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Updated: Jan 26, 2026

Production and Targeting of Monovalent Quantum Dots
Published on: October 23, 2014
Long Lived Photoexcitation Dynamics in π-Conjugated Polymer/PbS Quantum Dot Blended Films for Photovoltaic
Ruizhi Wang1, Xiaoliang Yan2, Xiao Yang3
1School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. wangruizhi1986@gmail.com.
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.
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