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Optimal optoelectronic properties of interfacial layers in perovskite solar cells are essential for achieving high power conversion efficiency. We herein demonstrated a solution-processed spinel CuCo2O4 as a hole transport layer to use in high-performance perovskite solar cells. The solution-processed CuCo2O4 possessed high electrical conductivity, high optical transparency in UV–vis–NIR, well-matched energy levels to perovskite, and efficient hole transport capability to the perovskite layer. The optoelectronic properties of CuCo2O4 were finely controlled by optimizing the annealing temperature, leading to a 14.12% power conversion efficiency in planar perovskite solar cells. Another impressive advantage for the CuCo2O4-based hole transport layer is a negligible hysteresis of the device at very low scan rate, which brought about highly stable and reliable photovoltaic performance. All of the results studied in this work suggest a bright future for solution-processed CuCo2O4 as a novel hole transport layer in perovskite solar cells with high efficiency and good stability.

The non-radiative energy loss in perovskite solar cells (PSCs) is a key factor that limits full potential of photovoltaic performance to values below the Shockley–Queisser limit. Herein, we report a...

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