Inverted perovskite solar cells without pre-depositing a layer of hole-transport materials (HTL-free PSCs) still suffer from the non-irradiative recombination at the perovskite/electron-transport layer (ETL) interface. In this work, we report a molecular complementary passivation (MCP) strategy by employing propylphosphonic acid 3-ammonium bromide (PPAABr) to cooperate with phenethylammonium bromide (PEABr) to mutually passivate surface defects of I and formamidinium (FA) vacancies by multi-coordination. This passivation led to an obvious decrease in interfacial defect-state density and greatly improved exciton and carrier lifetime for the perovskite film. Moreover, MCP surface treatment pushes the perovskite surface Fermi level closer to that of ETL, thereby enhancing interfacial electron extraction. As a result, MCP-based HTL-free PSC achieved a record efficiency of 26.40% (25.92% certified). The encapsulated device retains 94.8% of its initial efficiency after 1,000 h of light soaking. The generality of the MCP strategy also generated a competitive efficiency of 23.66% for 1.68 eV wide-band-gap PSCs.

中文翻译：

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通过分子互补钝化增强效率记录的无 HTL 倒置钙钛矿太阳能电池的电子传输

没有预沉积一层空穴传输材料（不含 HTL 的 PSC）的倒置钙钛矿太阳能电池在钙钛矿/电子传输层 （ETL） 界面处仍然受到非辐照复合的影响。在这项工作中，我们报道了一种分子互补钝化 （MCP） 策略，采用丙基膦酸 3-溴化铵 （PPAABr） 与苯乙基溴化铵 （PEABr） 协同，通过多配位相互钝化 I 和甲脒 （FA） 空位的表面缺陷。这种钝化导致界面缺陷态密度明显降低，并大大提高了钙钛矿薄膜的激子和载流子寿命。此外，MCP 表面处理使钙钛矿表面的费米能级更接近 ETL 的费米能级，从而增强了界面电子萃取。结果，基于 MCP 的无 HTL PSC 实现了创纪录的 26.40% 的效率（25.92% 的认证率）。封装的器件在轻度浸泡 1,000 小时后仍能保持 94.8% 的初始效率。MCP 策略的通用性还为 1.68 eV 宽带隙 PSC 产生了 23.66% 的竞争效率。