Rationally Induced Interfacial Dipole in Planar Heterojunction Perovskite Solar Cells for Reduced J–V Hysteresis. Issue 23 (21st June 2018)

• Record Type: Journal Article
• Authors: Liu, Zonghao; Chen, Qi; Lee, Jin‐Wook; Zhao, Zhixin; Xu, Xiaobao; Hsieh, Yao‐Tsung; Meng, Lei; Sun, Pengyu; Marco, Nicholas De; Zhou, Huanping; Cheng, Yi‐Bing; Yang, Yang
• Is Part Of: Advanced energy materials. Volume 8:Issue 23(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-06-21
• Subjects: dipoles -- hysteresis -- interfaces -- perovskites -- solar cells; Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201800568
• Languages: English
• ISSNs: 1614-6832

Abstract

Abstract: With the rapid progress in developing hybrid perovskite solar cells, the allure of current density–voltage ( J – V ) hysteresis has attracted quite a lot of interest in the research community. It requires feasible approaches that further deepen the fundamental understanding of device physics in specific device architecture in order to solve this problem eventually. Here, perovskite solar cells configured with different counter electrodes are systematically investigated with the focus on charge accumulation within the devices responsible for J – V hysteresis. The results indicate that J – V hysteresis is affected by charge accumulation which can be modulated by carrier extraction efficiency of the electrodes. Through a rationally induced interfacial dipole, the devices have shown improvement in carrier extraction, which thus reduces J – V hysteresis significantly. It provides solid evidence for the proposition that interface charge plays an important role in J – V hysteresis, and demonstrates an applicable strategy that effectively alleviates J – V hysteresis in perovskite solar cells. Abstract : A rationally induced interfacial dipole is introduced at the counter electrode interface to reduce current density–voltage hysteresis in perovskite solar cells. The relief of hysteresis is ascribed to the reduction of interface charge accumulation and enhancement of charge extraction caused by the interfacial dipole. The resultant devices exhibited high efficiency of 18.8% and low hysteresis index of 0.04.