Highly Transparent, Scalable, and Stable Perovskite Solar Cells with Minimal Aesthetic Compromise

摘要

Transparent photovoltaics (TPVs) can be integrated into the surfaces of buildingsand vehicles to provide point-of-use power without impacting aesthetics.Unlike TPVs that target the photon-rich near-infrared portion of the solarspectrum, TPVs that harvest ultraviolet (UV) photons can have significantlyhigher transparency and color neutrality, offering a superior solution forlow-power electronics with stringent aesthetic tolerance. In addition to beinghighly transparent and colorless, an ideal UV-absorbing TPV should also beoperationally stable and scalable over large areas while still outputting sufficientpower for its specified application. None of today’s TPVs meet all thesecriteria simultaneously. Here, the first UV-absorbing TPV is demonstratedthat satisfies all four criteria by using CsPbCl_(2.5)Br_(0.5) as the absorber. Byprecisely tuning the halide ratio during thermal co-evaporation, high-qualitylarge-area perovskite films can be accessed with an ideal absorption cutofffor aesthetic performance. The resulting TPVs exhibit a record average visibletransmittance of 84.6% and a color rendering index of 96.5, while maintainingan output power density of 11 W m~(?2) under one-sun illumination. Further, thelarge-area prototypes up to 25 cm~2 are demonstrated, that are operationallystable with extrapolated lifetimes of >20 yrs under outdoor conditions.