articleNature CommunicationsJun 7, 2019GOLD OA

Over 16% efficiency organic photovoltaic cells enabled by a chlorinated acceptor with increased open-circuit voltages

YCYong CuiHYHuifeng YaoJZJianqi ZhangTZTao ZhangYWYuming Wang

Chinese Academy of Sciences · Beijing National Laboratory for Molecular Sciences · +5 more institutions

PubMed
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Abstract

Broadening the optical absorption of organic photovoltaic (OPV) materials by enhancing the intramolecular push-pull effect is a general and effective method to improve the power conversion efficiencies of OPV cells. However, in terms of the electron acceptors, the most common molecular design strategy of halogenation usually results in down-shifted molecular energy levels, thereby leading to decreased open-circuit voltages in the devices. Herein, we report a chlorinated non-fullerene acceptor, which exhibits an extended optical absorption and meanwhile displays a higher voltage than its fluorinated counterpart in the devices. This unexpected phenomenon can be ascribed to the reduced non-radiative energy loss…

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13

Topics & keywords

Topics
Keywords
  • Open-circuit voltage
  • Photovoltaic system
  • Acceptor
  • Organic solar cell
  • Voltage
  • Materials science
  • Short circuit
  • Optoelectronics
UN Sustainable Development Goals
  • Affordable and clean energy
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