Organic photovoltaic cells are potential candidates to drive low power consumption off-grid electronics for indoor applications. However, their power conversion efficiency is still limited by relatively large losses in the open-circuit voltage and a non-optimal absorption spectrum for indoor illumination. Here, we carefully designed a non-fullerene acceptor named IO-4Cl and blend it with a polymer donor named PBDB-TF to obtain a photoactive layer whose absorption spectrum matches that of indoor light sources. The photovoltaic characterizations reveal a low energy loss below 0.60 eV. As a result, the organic photovoltaic cell (1 cm2) shows a power conversion efficiency of 26.1% with an open-circuit voltage of 1.10 V under a light-emitting diode illumination of 1,000 lux (2,700 K). We also fabricated a large-area cell (4 cm2) through the blade-coating method. Our cell shows an excellent stability, maintaining its initial photovoltaic performance under continuous illumination of the indoor light source for 1,000 hours.
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The data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.
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The authors acknowledge financial support from National Natural Science Foundation of China (Grant nos. 51673201 and 91633301), Beijing National 434 Laboratory for Molecular Sciences (Grant no. BNLMS-CXXM-201903), Chinese Academy of Sciences (Grant no. XDB12030200), the Swedish Research Council VR (2018-06048), the Swedish Energy Agency Energimyndigheten (2016-010174) and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant no. SFO-Mat-LiU #2009-00971). F.G. is a Wallenberg Academy Fellow and O.I. is a Wallenberg Academy Scholar.
J.B. and O.I. are co-founders of the company Epishine AB focused on commercializing OPV for indoor applications.
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Cui, Y., Wang, Y., Bergqvist, J. et al. Wide-gap non-fullerene acceptor enabling high-performance organic photovoltaic cells for indoor applications. Nat Energy 4, 768–775 (2019) doi:10.1038/s41560-019-0448-5
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