Abstract
The last five years have seen very active research in the field of environmentally friendly lead-free perovskite solar cells. Tin halide perovskites are certainly one of the most promising alternatives to lead-based perovskites, while the performance of present tin-based perovskite solar cells is still relatively low. Nevertheless, recent experiments on thin films with improved quality have indicated that tin halide perovskites can, in principle, provide a high device performance. In this Perspective, we summarize recent progress in the understanding of the fundamental photophysics of tin halide perovskite thin films. To identify the reason for the low performance of present devices, we discuss the energy loss mechanisms in solar cell structures from the viewpoint of photocarrier dynamics.
Highlights
Metal halide perovskites are semiconductor materials that have been subject to investigations for a long time, and much knowledge regarding their physical and chemical properties has been accumulated
To understand what is needed to realize more efficient solar cells based on tin halide perovskites, we briefly summarize the optical properties of lead halide perovskites
Due to the narrow bandgap of MASnI3 and a thick absorber layer of about 500 nm, a relatively high short-circuit current density (Jsc) of 26.1 mA/cm[2] is obtained. While this value exceeds the current density obtained in lead-based perovskite solar cells, it is only 67% of the upper limit that can be determined by the Eg of MASnI3, indicating a large current loss
Summary
Metal halide perovskites are semiconductor materials that have been subject to investigations for a long time, and much knowledge regarding their physical and chemical properties has been accumulated. Owing to recent improvements in the thin film quality, it has become possible to clarify the intrinsic optical properties of tin halide perovskites. The knowledge of these fundamental optical properties. Scitation.org/journal/apm of the semiconductor layer is essential since they determine the upper limit of the device performance and the optimum device structure.[9,10] In this Perspective, we provide a summary of the recent progress in the research of the fundamental optical properties of tin halide perovskites. We discuss the origin and possible solutions of the low performances of present lead-free tin perovskite solar cells from the viewpoint of carrier dynamics
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