Tin-lead (Sn-Pb) perovskite solar cells (PSCs) have gained interest as candidates for the bottom cell of all-perovskite tandem solar cells due to their broad absorption of the solar spectrum. A notable challenge arises from the prevalent use of the hole transport layer, PEDOT:PSS, known for its inherently high doping level. This high doping level can lead to interfacial recombination, imposing a significant limitation on efficiency. Herein, NaOH is used to dedope PEDOT:PSS, with the aim of enhancing the efficiency of Sn-Pb PSCs. Secondary ion mass spectrometer profiles indicate that sodium ions diffuse into the perovskite layer, improving its crystallinity and enlarging its grains. Comprehensive evaluations, including photoluminescence and nanosecond transient absorption spectroscopy, confirm that dedoping significantly reduces interfacial recombination, resulting in an open-circuit voltage as high as 0.90 V. Additionally, dedoping PEDOT:PSS leads to increased shunt resistance and high fill factor up to 0.81. As a result of these improvements, the power conversion efficiency is enhanced from 19.7% to 22.6%. Utilizing NaOH to dedope PEDOT:PSS also transitions its nature from acidic to basic, enhancing stability and exhibiting less than a 7% power conversion efficiency loss after 1176 h of storage in N₂ atmosphere.

中文翻译：

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通过 PEDOT:PSS 的氢氧化钠去掺杂提高锡铅钙钛矿太阳能电池的效率和稳定性

锡铅（Sn-Pb）钙钛矿太阳能电池（PSC）由于其对太阳光谱的广泛吸收，作为全钙钛矿串联太阳能电池底部电池的候选者而受到关注。空穴传输层 PEDOT:PSS 的普遍使用带来了一个显着的挑战，该层以其固有的高掺杂水平而闻名。这种高掺杂水平会导致界面复合，对效率造成重大限制。在此，NaOH 用于去掺杂 PEDOT:PSS，目的是提高 Sn-Pb PSC 的效率。二次离子质谱图表明钠离子扩散到钙钛矿层中，提高了其结晶度并扩大了其晶粒。包括光致发光和纳秒瞬态吸收光谱在内的综合评估证实，去掺杂显着减少了界面复合，从而导致开路电压高达 0.90 V。此外，去掺杂 PEDOT:PSS 导致分流电阻增加，填充因子高达 0.81 。这些改进的结果是，功率转换效率从 19.7% 提高到 22.6%。利用NaOH对PEDOT:PSS进行去掺杂还可以将其性质从酸性转变为碱性，从而增强稳定性，并且在N ₂气氛中储存1176小时后，功率转换效率损失小于7% 。