Hyperdispersed CoO_x nanofluids enables CsPbBr₃ gradient hybrid photo-response layer for superb perovskite laser cells

Recent years have seen significant interest in photovoltaic conversion systems tailored not for solar insolation but for particular laser frequencies operating in transmission windows as a means to deliver energy remotely to a consumer. The recent advent of lead halide perovskite-based photovoltaics, calls for the exploration of their use also in such applications. Here, we present perovskite laser cells (PLCs) with significantly enhanced performance by hybridizing the CsPbBr₃ with CoOx nanocrystals for optimizing the active layer and its interface with the cathode. The CoO_x composite can accelerate solute consumption and guarantee low-density nucleation in the precursor for improving the crystalline grains size. We present a laser-electric photovoltaic generator with an active absorber layer of CoO_x-CsPbBr₃ under conditions of atmospheric (420 nm) and underwater (505 nm) transmission windows, whose performance significantly exceeds that of the reference CsPbBr₃ one. The champion device obtained an ultrahigh PCE of 62.77 % under laser irradiation with a wavelength of 505 nm and power intensity of 80 mW·cm⁻². This study not only provides a hybridization engineering strategy technique with the synergy of gradient engineering and surface optimization for improving the absorber film and its interface with the cathode, but also provides opportunities for multiple scenarios of remote power transmission applications.