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Title: The Effects of Chromophore Halogenation on the Stability of UV‐Absorbing Organic Solar Cells

Journal Article · · Advanced Energy Materials
 [1];  [2];  [3];  [2];  [4];  [4]; ORCiD logo [5]
  1. Department of Chemical and Biological Engineering Princeton University Princeton NJ 08544 USA, Department of Electrical Engineering Princeton University Princeton NJ 08544 USA
  2. Andlinger Center for Energy and the Environment Princeton University Princeton NJ 08544 USA
  3. Department of Chemical and Biological Engineering Princeton University Princeton NJ 08544 USA
  4. Princeton Institute for Science and Technology of Materials Princeton University Princeton NJ 08544 USA
  5. Department of Chemical and Biological Engineering Princeton University Princeton NJ 08544 USA, Andlinger Center for Energy and the Environment Princeton University Princeton NJ 08544 USA

Abstract 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.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0012704
OSTI ID:
1804576
Journal Information:
Advanced Energy Materials, Journal Name: Advanced Energy Materials Journal Issue: 16 Vol. 11; ISSN 1614-6832
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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