1 research outputs found
Stress compensation based on interfacial nanostructures for stable perovskite solar cells
Abstract The longāterm stability issue of halide perovskite solar cells hinders their commercialization. The residual stressāstrain affects device stability, which is derived from the mismatched thermophysical and mechanical properties between adjacent layers. In this work, we introduced the Rb2CO3 layer at the interface of SnO2/perovskite with the hierarchy morphology of snowflakeālike microislands and dendritic nanostructures. With a suitable thermal expansion coefficient, the Rb2CO3 layer benefits the interfacial stress relaxation and results in a compressive stressāstrain in the perovskite layer. Moreover, reduced nonradiative recombination losses and optimized band alignment were achieved. An enhancement of openācircuit voltage from 1.087 to 1.153āV in the resultant device was witnessed, which led to power conversion efficiency (PCE) of 22.7% (active area of 0.08313ācm2)Ā and 20.6% (1ācm2). Moreover, these devices retained 95% of its initial PCE under the maximum power point trackingĀ (MPPT) after 2700āh. It suggests inorganic materials with high thermal expansion coefficients and specific nanostructures are promising candidates to optimize interfacial mechanics, which improves the operational stability of perovskite cells