Efficient perovskite solar cells by hybrid perovskites incorporated with heterovalent neodymium cations

Abstract

Recently, hybrid perovskite materials have emerged as attractive alternatives for realizing cost-effective efficient perovskite solar cells. To date, impressive efficiency has been realized from the state-of-the-art solar cells through generic interface engineering and film morphological manipulation of perovskite active-layer in macroscopic scale. To further boost the efficiency of perovskite solar cells, microscopically tuning optoelectronic properties of hybrid perovskite materials represents a promising direction. In this study, we report efficient perovskite solar cells by a novel hybrid perovskites material that is incorporated with heterovalent neodymium cations (Nd3+). As compared with pristine hybrid perovskite materials, Nd3+-doped hybrid perovskite materials possess superior film quality with highly reduced trap-states, significantly enlarged charge carrier lifetimes, dramatically enhanced and balanced charge carrier mobilities. As a result, planar heterojunction perovskite solar cells by Nd3+-doped hybrid perovskite materials exhibit highly reproducible power conversion efficiency of 21.15% and significantly suppressed photocurrent hysteresis. These findings open a new window of tuning the optoelectronic properties of hybrid perovskite materials and boosting the device performance of perovskite solar cells. 21.15% power conversion efficiency and significantly suppressed photocurrent hysteresis were demonstrated from planar heterojunction perovskite solar cell using heterovalent neodymium cation doped hybrid perovskite materials.