Enhancing\nHole Extraction and Transfer via Phthalocyanine-Assisted\nHole Transport Material for High-Performance Perovskite Solar Cells

Enhancing hole extraction and transfer of the hole transport\nlayer\n(HTL) is urgently needed to achieve excellent performance perovskite\nsolar cells. Herein, a novel phthalocyanine (TQ) has been introduced\ninto Spiro-OMeTAD to finely optimize the hole transport properties\nof the HTL for achieving better performance. It is demonstrated that\nTQ incorporation can effectively enhance hole extraction/transfer\nand reduce charge recombination in the device. The TQ-treated device\nyields an improved power conversion efficiency of 24.29% from 21.91%.\nRemarkably, these unencapsulated devices demonstrate remarkable moisture,\nlight, and thermal stabilities.