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In comparison to hybrid perovskite solar cells (PSCs), all‐inorganic CsPbX3 PSCs suffer from larger VOC deficits, leading to inferior efficiency. The perovskite surface defects like iodine vacancy (VI) are the main sources of nonradiative recombination causing a VOC deficit. Here, 2,5‐thiophenedicarboxylic acid (TDCA) is used to passivate the surface VI through the strong coordination interaction...
To abate the issue of moisture‐assisted phase transition of CsPbI2Br, caused by hygroscopic dopants used in the hole‐transporting material (HTM), developing dopant‐free HTMs is necessary. In this work, a new polymer, PDTDT, is developed as a dopant‐free HTM for CsPbI2Br solar cells, and the device performance and stability are systematically compared with cells employing dopant‐free P3HT. CsPbI2Br...