期刊
ADVANCED ENERGY MATERIALS
卷 11, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202100225
关键词
crystallization; halogenation; organic solar cells; S‐ kink; stability
类别
资金
- U.S. DOE Office of Science Facilities [DE-SC0012704]
- Princeton Center for Complex Materials, a National Science Foundation (NSF)-MRSEC program [DMR-1420541]
- National Science Foundation [DMR-1627453, CMMI-1824674, STTR-1843743]
- Arnold and Mabel Beckman Foundation
- Princeton's Presidential Postdoctoral Fellowship
Transparent photovoltaics using ultraviolet photons as energy sources are suitable for lower power applications like regulating lighting and temperature in electrochromic windows. The study shows that halogenated chromophores can cause degradation in operational stability of photovoltaic devices, which should be taken into consideration during molecular design process.
Transparent photovoltaics that harvest ultraviolet photons are promising point-of-use power sources for lower power applications, such as electrochromic windows that regulate the flow of visible and infrared photons for lighting and temperature regulation. Organic photovoltaic cells employing contorted hexabenzocoronene (cHBC) and its derivatives as chromophores have shown promise for transparent solar cells due to their high open-circuit voltages, large-area scalability, and high photoactive layer transparency. Here, the operational stability of such devices is investigated and it is found that the solar cell active layers that include peripherally halogenated chromophores undergo rapid morphological degradation during operation, while control cells employing cHBC and other non-halogenated derivatives as donors with archetype C-70 as an acceptor are highly stable. This study suggests halogenation of chromophores can play an outsized role in determining the operational stability of devices comprising them, which should be considered during the molecular design process.
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