大斯托克斯位移的Mn2+掺杂(PEA)2PbBr4钙钛矿用于高效发光太阳能聚光器OA

Luminescent solar concentrators(LSCs)have attracted significant attention due to their potential in large-area building-integrated photovoltaics.To realize efficient LSC,it is necessary to overcome the reabsorption losses while maintaining a high photoluminescence quantum yield(PLQY)and broad-spectrum absorption.Organic-inorganic two-dimensional hybrid perovskite materials,such as(PEA)2PbBr4(PEA+=C8H12N+),have shown promis-ing prospects in low-cost optoelectronic devices.It is crucial for LSC to independently regulate the absorption and emission properties by using the doping strategies.However,the inherent small Stokes shift of intrinsic two-dimen-sional perovskites leads to severe reabsorption losses,which limit the efficiency of LSC.In this work,Mn2+doped two-dimensional Mn∶(PEA)2PbBr4 was successfully prepared via a high-temperature solid-state method.Its optical properties were investigated,and device performance for application in LSCs was evaluated.The results demonstrat-ed that Mn2+doping induces a large Stokes shift of up to 310 nm with the absorption peak at～300 nm and the emis-sion peak at～610 nm.The perovskite materials were embedded into a polydimethylsiloxane(PDMS)polymer matrix at varying mass fractions(0.15%-0.75%)to fabricate Mn∶(PEA)2PbBr4@PDMS thin films.Photovoltaic perfor-mance tests revealed that the 0.60%Mn∶(PEA)2PbBr4@PDMS film delivered the optimal performance,achieving an external optical efficiency(ηopt)of 7.57%and a maximum power conversion efficiency(PCE)of 1.246%under standard AM1.5G illumination.