Biopolymer Buried Interface Modification for Efficient Semitransparent Perovskite Solar Cells with Improved Carrier Dynamics

Abstract

Semitransparent perovskite solar cells (ST-PSCs) have the potential application in the buildings and vehicle integrated photovoltaics (IPV) to maximize the use of solar energy. However, to satisfy the criteria for applications in IPV, it is still challenging for ST-PSCs to meet high photoelectric conversion efficiency (PCE) and decent average visible transmittance (AVT) simultaneously. Herein, we firstly choose the commonly used Cs0.1FA0.9PbI3 to study the relationship between the perovskite film thickness and the crystallization quality for achieving the optimal perovskite film with high transmittance and excellent crystallization. Then, the natural biopolymer sodium hyaluronate (HA) was applied as the interface layer between the hole transport layer and the perovskite layer to further passivate the interface defect, regulate the carrier dynamics and improve device photovoltaic performance. The results show that HA effectively passivates the defects of the nickel oxide (NiOx) and perovskite layers, enhances the crystalline quality of perovskite film, inhibits non-radiative recombination at the interface, and increases the carrier extraction rate. Therefore, the ST-PSCs device with HA modification achieves a maximum PCE 16.02%, with AVT 33% and light utilization rate 5.28%. In addition, the device retains about 92% of the initial PCE after aged 1100 h in air with 30%-40% relative humidity. This work provides a simple and efficient method to optimize the crystalline quality and improve interface carrier dynamics for achieving ST-PSCs with high PCE and AVT.