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      Metal oxides and noble metals application in organic solar cells

      , , , , ,
      Solar Energy
      Elsevier BV

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          A fluorene-terminated hole-transporting material for highly efficient and stable perovskite solar cells

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            Is Open Access

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

            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 (0.206 eV). Due to the simultaneously improved short-circuit current density and open-circuit voltage, a high efficiency of 16.5% is achieved. This study demonstrates that finely tuning the OPV materials to reduce the bandgap-voltage offset has great potential for boosting the efficiency.
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              Plasmonics for improved photovoltaic devices.

              The emerging field of plasmonics has yielded methods for guiding and localizing light at the nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics researchers are turning their attention to photovoltaics, where design approaches based on plasmonics can be used to improve absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of solar photovoltaic absorber layers, and yielding new options for solar-cell design. In this review, we survey recent advances at the intersection of plasmonics and photovoltaics and offer an outlook on the future of solar cells based on these principles.
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                Author and article information

                Journal
                Solar Energy
                Solar Energy
                Elsevier BV
                0038092X
                September 2020
                September 2020
                : 207
                : 347-366
                Article
                10.1016/j.solener.2020.06.084
                6699eedf-3312-4d30-a0f4-499d641c17e7
                © 2020

                https://www.elsevier.com/tdm/userlicense/1.0/

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