Characterization study of perovskite solar cells with incorporation of organic long persistent luminescence

Organic/inorganic metal halide perovskites are receiving a lot of interest as next generation solar technology material due to their low-cost and good performance. In this work, we investigated perovskite solar cells (PSCs) with the incorporation of long persistence luminescence (LPL) material. Room temperature mixed-cation perovskite material FAMAPbI3 was prepared for application in PSCs. To enhance the PSC performance, LPL material was integrated externally to the cell structure. XRD, SEM, and photoluminescence (PL) spectroscopy were performed to reveal the phase, morphology, and emission spectra of the samples. The findings revealed that LPL material affected the performance of PSCs to a certain degree. The charge-transfer features occurring at the interface between the electron transport layer and perovskite film were further examined using electrochemical impedance spectroscopy technique. From the optical observation, when electron donating group of TMB molecules were mixed with the electron accepting group of PPT molecules, it resulted a better luminescence effect. The PSC performances highlight the potential for removing expensive hole-transport layer and costly high-vacuum deposition techniques from the fabrication processes.