journal article·2022-04Open access

The Molecular Ordering and Double‐Channel Carrier Generation of Nonfullerene Photovoltaics within Multi‐Length‐Scale Morphology

Jinqiu Xu, Sae Byeok Jo, Xiankai Chen, Guanqing Zhou, Ming Zhang, Xueliang Shi, Francis Lin, Lei Zhu, Tianyu Hao, Ke Gao, Yecheng Zou, Xuan Su, Wei Feng, Alex K.‐Y. Jen, Yongming Zhang, Feng Liu

Advanced Materials· Volume 34· Issue 16

Abstract

Abstract The success of nonfullerene acceptor (NFA) solar cells lies in their unique physical properties beyond the extended absorption and suitable energy levels. The current study investigates the morphology and photophysical behavior of PBDB‐T donor blending with ITIC, 4TIC, and 6TIC acceptors. Single‐crystal study shows that the π–π stacking and side‐chain interaction dictate molecular assembly, which can be carried to blended films, forming a multi‐length‐scale morphology. Spontaneous carrier generation is seen in ITIC, 4TIC, and 6TIC neat films and their blended thin films using the PBDB‐T donor, providing a new avenue of zero‐energy‐loss carrier formation. The molecular packing associated with specific contacts and geometry is key in influencing the photophysics, as demonstrated by the charge transfer and carrier lifetime results. The 2D layer of 6TIC facilitates the exciton‐to‐polaron conversion, and the largest photogenerated polaron yield is obtained. The new mechanism, together with the highly efficient blending region carrier generation, has the prospect of the fundamental advantage for NFA solar cells, from molecular assembly to thin‐film morphology.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Perovskite Materials and Applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Frontiers Science Center for Transformative Molecules Center of Hydrogen Science, and In Situ Center for Physical Sciences School of Chemistry and Chemical Engineering Shanghai Jiao Tong University Shanghai 200240 P. R. China

Department of Materials Science and Engineering and Department of Chemistry University of Washington Seattle WA 98195 USA

School of Chemical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

Center for Organic Photonics and Electronics Research (OPERA) Kyushu University Fukuoka 819‐0395 Japan

Science Center for Material Creation and Energy Conversion Institute of Frontier and Interdisciplinary Science Shandong University Qingdao 266237 P. R. China

State Key Laboratory of Fluorinated Functional Membrane Materials and Dongyue Future Hydrogen Energy Materials Company Zibo City Shandong Province 256401 P. R. China

Department of Chemistry City University of Hong Kong Kowloon Hong Kong 999077 China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Shanghai · Natural Science Foundation of Shandong Province · Office of Naval Research

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