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Hybrid Quantum Dot/Organic Heterojunction: A Route to Improve Open-Circuit Voltage in PbS Colloidal Quantum Dot Solar Cells

We have successfully demonstrated the effect of a thin organic bulk-heterojunction (BHJ) interlayer on improving the photovoltaic performance of lead sulfide (PbS) colloidal quantum dot (CQD) solar cells. Multiple organic BHJ films with PTB7-Th blending with various N-type acceptors have been introd...

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Bibliographic Details
Published in:ACS energy letters 2020-07, Vol.5 (7), p.2335-2342
Main Authors: Zhang, Yannan, Kan, Yuanyuan, Gao, Ke, Gu, Mengfan, Shi, Yao, Zhang, Xuliang, Xue, Ye, Zhang, Xuning, Liu, Zeke, Zhang, Yuan, Yuan, Jianyu, Ma, Wanli, Jen, Alex K.-Y
Format: Article
Language:English
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Summary:We have successfully demonstrated the effect of a thin organic bulk-heterojunction (BHJ) interlayer on improving the photovoltaic performance of lead sulfide (PbS) colloidal quantum dot (CQD) solar cells. Multiple organic BHJ films with PTB7-Th blending with various N-type acceptors have been introduced as hole-transporting layer (HTL) in PbS solar cells. Significant enhancement in V oc was achieved in the hybrid devices compared to devices based on conventional HTLs like 1,2-ethanedithiol-treated PbS. Systematic characterizations reveal that the hybrid CQD/organic BHJ architecture can effectively modulate the interfacial charge dynamics and lead to enhanced external quantum efficiency, resulting in a champion efficiency of 12.02%. Solution-processed hybrid CQD/organic architecture may become a universal approach to improve the photovoltaic performance and scalability of PbS CQD solar cells.
ISSN:2380-8195
2380-8195
DOI:10.1021/acsenergylett.0c01136