Effect of Organic Long Persistent Luminescence on Hole Transport Material-Free Perovskite Solar Cell

This work focuses on the study of perovskite materials as the active component in perovskite solar cells (PSCs). Hole transport material-free PSCs consisting of perovskite MAPbI3 and FAMAPbI
3
were fabricated under ambient conditions. To enhance the functionality of PSCs, a mixture of organic long persistent luminescence (LPL) materials, namely TMB and PPT, and an inorganic LPL material, strontium aluminate doped with europium and dysprosium (SrAl
2
O
3
), were integrated into the cell structure, allowing operation in the low light conditions. The afterglow effect observed in the LPL materials was investigated in relation to its impact on the solar cell performance. Specifically, the influence of mixed organic LPL materials on the optical properties was examined. The results showed that an LPL mixture with TMB:PPT = 7:3 (by mass) exhibited the highest photoluminescence (PL) response. The integration of LPL materials presents a novel approach to enable PSCs to operate with improved performances. Additionally, the power conversion efficiency of three different setups of PSCs was evaluated. The findings revealed that PSCs with the inorganic LPL material achieved improved performance attributed to the light down-conversion effect.