| 초록 |
Photo-induced charges accumulated at the interface between perovskite layer and hole transport layer can be detected by light–induced electron-spin-resonance (LESR) spin density in a perovskite solar cell (PSC). The LESR spectra, which show thermal dependence, were diminished as temperature decreased from room temperature to 170 K in a PSC and disappeared below ~170K. At the same time, the photocurrent was decreased only ~25% between room temperature and 170K. According to the variation of LESR spin density and photo current at the different temperature, we concluded that decreased transient or steady photocurrent at the low temperatures mainly attributed to the delocalized holes trapped at the interface between perovskite and HTL. |
