2021 Adv. Energy Mater. (IF 29.368), Stability over 10,000 Hours, the Secret of Perovskite/Silicon Tandem Solar Cell

　　Advanced Energy Materials (IF 29.368) published a research result in November 2021. Scientists induced perovskite/silicon tandem solar cells through the wide band gap interface layer and achieved stability of more than 10,000 hours.

　　In order to break through the efficiency limitation of silicon cells, perovskite/silicon tandem solar cell (PK/c-Si TSC) is a reasonable choice. In this research, scientists put p-i-n perovskite on a full-texture c-Si solar cell and constructed a monolithic tandem solar cell (TSC). Through the evaporation-solution combination technology, p-i-n perovskite solar cells are grown conformally on a full-texture silicon heterojunction cell to achieve PK/c-Si TSC at both ends.

　　Since the residual PbI₂ at the bottom of the perovskite body will adversely affect the performance of the device, scientists have introduced a thin layer of thermally evaporated CsBr between the perovskite layer and the hole transport layer to construct a gradient perovskite absorber and optimize energy Level alignment, thereby improving the open circuit voltage and fill factor of the device. Through the solar simulator and standard silicon reference cell of Enlitech, scientists analyzed the photovoltaic characteristics of solar cells and verified that the PK/c-Si tandem battery achieved an efficiency of 27.48% and was stable in nitrogen for more than 10,000 hours. The solar simulator and KA-6000 software of Enlitech also provide monitoring of the short-circuit current over time to prove the stability of the solar cell!

　　However, if you want to increase efficiency by more than 30%, there are still many opportunities waiting to be tapped. For example, increasing the FF of PK/c-Si TSC to more than 80% is a topic worthy of study. In any case, scientists believe that the full-texture PK/c-Si TSC has unlimited potential, and hope that this structure can open up a path for commercialization of low-cost tandem devices.