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A Chinese research group has, for the first time, broken through the primary obstacle that has been limiting the efficiency of formal-structure perovskite solar cells. They have introduced an innovative design featuring a continuously gradient-doped electron transport layer. Leveraging this strategy, the solar cell device attained a remarkable steady-state photoelectric conversion efficiency of 27.17% and a reverse scan efficiency of 27.50%. This achievement marks a new benchmark for the highest photoelectric conversion efficiency ever recorded in formal-structure perovskite photovoltaic devices. This groundbreaking work was a collaborative effort by the teams led by Yuan Mingjian and Jiang Yuanzhi from Nankai University, along with Xu Jian from the Beijing Institute of Technology. The research findings were published online in the esteemed journal Nature on April 30.
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