Interface charge accumulation dynamics in 3D and quasi-2D perovskite solar cells. (15th October 2020)

• Record Type: Journal Article
• Authors: Liu, Guilin; Zhou, Ning; Tan, Shunquan; Zhang, Juchen; Chen, Qi; Zhou, Huanping
• Is Part Of: Journal of physics. Volume 54:Number 1(2021)
• Publication Date: 2020-10-15
• Subjects: perovskite solar cells -- interface charge accumulation -- ion migration -- capacitance; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/abb049
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Perovskite solar cells (PSCs) have rapidly developed in recent years with the advantages of high efficiency and low cost. Although PSCs are the fastest-advancing solar technology to date, bottlenecks such as J – V hysteresis have limited the further development significantly. In this work, we have investigated the in-depth mechanism of hysteresis in both three-dimensional (3D) and quasi-2D (Q-2D) planar p-i-n PSCs. We conducted scanning-rate-dependent and temperature-dependent measurements to distinguish the ion migration and the capacitive charging. The coefficient for capacitance and pseudocapacitance from the J – V curves are further employed to analysis the hysteresis. It is found that both capacitance and ion migration contribute to the J – V hysteresis, but play different roles in 3D and Q-2D perovskite devices. In 3D PSCs, the ion migration has substantial impacts on the J – V hysteresis, wherein ions are tending to move. While in the Q-2D PSCs, the capacitance extends the characteristic charging time, which is mainly responsible for J – V hysteresis. These findings will help to effectively suppress the hysteresis for 3D and Q-2D PSCs, eventually benefiting device performance and long term stability.