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Wide-band-gap perovskite solar cells (PSCs) are considered an important part of multijunction tandem solar cells and have attracted extensive research in related fields. For blade-coated inverted wide-band-gap PSCs, nonradiative recombination losses in the perovskite/charge transport layer interface are serious. The performance of blade-coated wide-band-gap perovskite solar cells has hindered the industrialization of tandem solar cells, especially for two-terminal perovskite/silicon tandem solar cells (TSCs). To reduce these losses as much as possible, the choice of hole transport layers and perovskite films post-treatment is extremely important. Herein, we used two strategies: a hybrid self-assembled monolayer as the hole transport layer and surface passivation post-treatment to obtain highly efficient and stable PSCs by the blade-coating method. The champion device demonstrated an efficiency of 21.30% for p-i-n PSCs, which is one of the highest efficiencies for band gaps above 1.67 eV among all of the scalable preparation methods employed.
Huang et al. (Thu,) studied this question.