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FA-based perovskite devices with reduced Pb contents were prepared.

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Organic–inorganic hybrid perovskites have been recognized as prospective materials for use in radiation detection application due to their high atomic number, ease of crystal processing, and excellent electronic properties. Herein, solution‐synthesized MAPbBr3 and CsPbBr3 detectors with different structures are constructed. Charge diffusion length and trap density analysis reveal that CsPbBr3 possesses better thermal stability but worse charge‐transport properties than MAPbBr3. To improve the signal current under X‐ray radiation, MoO3 is applied as a hole‐extraction layer to increase hole‐carrier collection. The sensitivity of X‐ray detectors with MoO3 layer can reach up to 2552 μC Gyair−1 cm−2 at an electric field of 45 V cm−1, which is higher than that without the MoO3 layer. It is shown that charge‐transport capability significantly affects the response of the signal current to X‐ray radiation; it also reveals the importance of interface engineering as a means to realize high‐sensitivity X‐ray detectors.

Solar cells based on perovskite absorbers are rapidly emerging as attractive candidates for photovoltaics development. Understanding the role of the electron-transport layer (ETL) is very important to obtain highly efficient perovskite solar cells. Herein, the effect of the ETL on device performance in planar perovskite solar cells is investigated in detail, and the band bending in different situations is discussed. The ET barrier is shown to be responsible for the poor fill factor (FF) of J-V curves. Introduction of a thin bathocuproine interlayer increases the interface inversion and results in an increase of FF from 56 to 76 %. Some experimental and theoretical results verify these conclusions. Furthermore, this study can provide an interface-engineering strategy to improve device performance.