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Enhancing the Performance of Polymer Solar Cells via Core Engineering of NIR‐Absorbing Electron Acceptors
Author(s) -
Dai Shuixing,
Li Tengfei,
Wang Wei,
Xiao Yiqun,
Lau TszKi,
Li Zeyuan,
Liu Kuan,
Lu Xinhui,
Zhan Xiaowei
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201706571
Subject(s) - materials science , core (optical fiber) , polymer , electron , electron acceptor , nanotechnology , organic solar cell , optoelectronics , solar cell , chemical engineering , engineering physics , photochemistry , composite material , chemistry , physics , quantum mechanics , engineering
In order to utilize the near‐infrared (NIR) solar photons like silicon‐based solar cells, extensive research efforts have been devoted to the development of organic donor and acceptor materials with strong NIR absorption. However, single‐junction organic solar cells (OSCs) with photoresponse extending into >1000 nm and power conversion efficiency (PCE) >11% have rarely been reported. Herein, three fused‐ring electron acceptors with varying core size are reported. These three molecules exhibit strong absorption from 600 to 1000 nm and high electron mobility (>1 × 10 −3 cm 2 V −1 s −1 ). It is proposed that core engineering is a promising approach to elevate energy levels, enhance absorption and electron mobility, and finally achieve high device performance. This approach can maximize both short‐circuit current density ( J SC ) and open‐circuit voltage ( V OC ) at the same time, differing from the commonly used end group engineering that is generally unable to realize simultaneous enhancement in both V OC and J SC . Finally, the single‐junction OSCs based on these acceptors in combination with the widely polymer donor PTB7‐Th yield J SC as high as 26.00 mA cm −2 and PCE as high as 12.3%.