High-Performance Perovskite Photovoltaics by Heterovalent Substituted Mixed Perovskites

2D perovskites are relatively stable but possess poor charge transport compared to 3D perovskites. To boost charge transport, novel 2D perovskites mixed with 3D perovskites are developed, where Pb2+ are partially substituted by the heterovalent neodymium cations (Nd3+) within both 2D and 3D perovskites (termed Nd3+-substituted 2D:3D mixed perovskites. Systematical studies reveal that the Nd3+-substituted 2D:3D mixed perovskites possess larger crystals, superior crystallinity, suppressed non-radiative charge recombination, and enhanced and balanced charge transport compared to the 2D:3D mixed perovskites. As a result, perovskite photovoltaics based on the Nd3+-substituted 2D:3D mixed perovskites exhibit a power conversion efficiency of 22.11%, a photoresponsibility of over 700 mA W-1, a photodetectivity of 4.29 x 10(14) cm Hz(1/2) W-1, a linear dynamic range of 165 dB at room temperature, and dramatically boosted stability. These results demonstrate that, a facile way is developed to realize high-performance perovskite photovoltaics through partially heterovalent substituted Pb2+ by Nd3+ within 2D:3D mixed perovskites.

Automated summary

Partially substituting Pb2+ with Nd3+ in 2D and 3D perovskites can enhance the performance of photovoltaic devices, including larger crystal size, superior crystallinity, suppressed non-radiative charge recombination, and enhanced and balanced charge transport. The perovskite photovoltaics based on this substitution exhibit high power conversion efficiency, photoresponsibility, photodetectivity, linear dynamic range, and dramatically boosted stability.