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Carbon‐based hole transport layer‐free perovskite solar cells (PSCs) based on methylammonium lead triiodide (MAPbI3) have become one of the research focus due to low cost, easy preparation, and good optoelectronic properties. However, instability of perovskite under vacancy defects and stress–strain makes it difficult to achieve high‐efficiency and stable power output. Here, a soft‐structured long‐chain...
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