Temperature‐ and Bias‐Dependent Degradation and Regeneration of Perovskite Solar Cells with Organic and Inorganic Hole Transport Layers. Issue 7 (1st February 2021)

• Record Type: Journal Article
• Authors: Swartz, Craig H.; Khakurel, Nischal; Najar, Selena R.; Hossain, Mohammed I.; Zakhidov, Alex
• Is Part Of: Physica status solidi. Volume 218:Issue 7(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-02-01
• Subjects: capacitance transient -- charge transport -- MAPI -- organometallic halide perovskites -- photovoltaic devices; Solid state physics -- Periodicals; Solids -- Industrial applications -- Periodicals; 530.41
• DOI: 10.1002/pssa.202000721
• Languages: English
• ISSNs: 1862-6300

Abstract

Abstract : Hybrid halide perovskite solar cells have drawn widespread attention with the achievement of high power conversion efficiencies. However, poor stability remains the greatest barrier preventing their commercialization. Performance degradation and recovery have a complicated dependence on the environment and a dependence on the applied bias, which affects ion migration. Herein, solar cells with an organic hole transport layer and cells with an inorganic hole transport layer are compared. A type of degradation of the organic transport layer is examined, which is reversible by applying a forward bias soak, and how the degradation arises from ion migration mechanisms is explained. Experimental current–voltage and capacitance transient measurements are conducted as a function of temperature. The resulting S‐kink and positive capacitance decay are explained in terms of the modeled effects of a changing ion density at the hole transport layer. An irreversible degradation is found upon heating to more than 100 °C. On the contrary, the inorganic hole transport layer is found to eliminate the observable effects of ion migration, even at elevated temperatures, so long as air exposure is avoided. Abstract : The stability of halide perovskite solar cells is examined, showing that severe storage degradation is often reversible by bias soaking. Ion migration mechanisms are found to be responsible. Capacitance decay is used to study the migration, and the common transient ion drift model for capacitance decay is found to be in need of revision before use in perovskite cells.