Organic-inorganic lead halide perovskite solar cells have shown a rapid increase in power conversion efficiency (PCE) in the past decade. However, their performance still suffers from trap-assisted decline due to defects at the surface and grain boundaries in the polycrystalline active layer. In this study, a thin BAI layer was formed on the CHNHPbI surface, which was then transformed into either a two-dimensional (2D) perovskite layer (BAPbI) or the organic salt itself by controlling the post-annealing process. A variety of characterization results show that the 2D perovskites could effectively reduce the trap-assisted charge recombination and increase the device stability. Therefore, a remarkably enhanced PCE of 20.6% was achieved in the modified inverted perovskite solar cells.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9036553 | PMC |
| http://dx.doi.org/10.1039/d1ra02260a | DOI Listing |
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