journal article·2021-08-13

Marcus Hole Transfer Governs Charge Generation and Device Operation in Nonfullerene Organic Solar Cells

Guanqing Zhou, Ming Zhang, Zeng Chen, Jianyun Zhang, Lingling Zhan, Shuixing Li, Lei Zhu, Zedong Wang, Xiaozhang Zhu, Hongzheng Chen, Linjun Wang, Feng Liu, Haiming Zhu

ACS Energy Letters· Volume 6· Issue 8
Publisher page

Abstract

A critical fundamental question regarding how the energetics governs the hole transfer (HT) rate, efficiency, and device performance in nonfullerene acceptor (NFA) organic solar cells (OSCs) remains unclear. In this study, we thoroughly investigate the HT process in a large group of donor/NFA blends with driving forces varied by ∼0.5 eV. We show that the HT rate increases by more than 2 orders of magnitude with increasing driving force, regardless of materials, which can be well-described by the Marcus electron transfer model with a normal region behavior. Importantly, HT efficiency that depends on the competition between HT and intrinsic relaxation of NFAs remains above 80% as long as the driving force is larger than 50 meV, setting a critical threshold for high HT efficiency. The multivariable correlation between driving force and device performance is also analyzed in connection with the nanoscale morphology. The driving force and morphology affect device performance from different aspects, enabling a new knob for manipulating internal electronic processes separately to obtain optimized device performance.
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Research context

OpenAlex topics: Organic Electronics and Photovoltaics · Conducting polymers and applications · Nanowire Synthesis and Applications

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

Affiliations

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

State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, China

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P.R. China

MOE Key Laboratory of Macromolecular Synthesis and Functionalization, State Key Laboratory of Silicon Materials, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, P.R. China

Funding

Ministry of Education of the People's Republic of China · Ministry of Science and Technology of the People's Republic of China · National Natural Science Foundation of China · Center of Hydrogen Science, Shanghai Jiao Tong University · Beijing National Laboratory for Molecular Sciences

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