Publication date: 31st May 2020
Recently, lead halide perovskite solar cells have demonstrated impressive efficiencies exceeding 25%, but their practical application is still hampered by stability problems. Besides the intensively investigated photochemical and thermal degradation effects, a particular attention should be paid to the electrochemical stability of absorber materials and completed photovoltaic devices.
Here we report a systematic comparative study of the electrochemical stability of lead halide based perovskite solar cells assembled with different hole-transport materials such as PEDOT:PSS, NiOx, PTAA, CuI, Cu2O, CuSCN and their combinations. Devices were exposed to a stepwise potentiostatic polarization under anoxic conditions in dark. The evolution of the solar cell performance was analyzed using ToF-SIMS profiling to unravel ion migration and possible redox processes occurring at the cathode and anode. The obtained results showed that the electrochemical stability of perovskite solar cells is largely affected by the used HTL materials. We also demonstrated influence of polarization conditions to the degradation on the example of PTAA hole-transport material. The revealed degradation pathways featured a crucial importance of controlling interfacial electrochemistry while designing highly efficient and stable perovskite solar cells.
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