Nowadays, perovskite solar cells (PSCs) have gained significant attention as one of the most promising new energy technologies. However, the application of spiro-OMeTAD, a highly efficient organic hole transport material (HTM) in PSCs, is limited due to its inherent weaknesses in conductivity and hole mobility. Here, a free radical initiator, tert-butyl peroxy-2-ethylhexanoate (TBPEH) is introduced to induce the rapid and controllable oxidation of Spiro. TBPEH-modified hole transport layer (HTL) produces more free radical cations, increasing carrier mobility and electrical conductivity. A smoother surface of the modified HTL improves the charge transport efficiency. Additionally, trap-state density and defect-induced nonradiative recombination of TBPEH-modified device are decreased. In addition, better energy level matching between the HTL and perovskite layer enables more efficient hole transport. Consequently, the PSC doped with TBPEH achieves a champion power conversion efficiency (PCE) of 24.33 %, surpassing the PCE of 21.72 % obtained from the pristine device. Furthermore, the TBPEH-modified devices show better stability. Storing in the atmosphere at 30 % relative humidity for 42 days, the TBPEH-modified device maintains 90.8 % of its highest efficiency, compared to the 73.8 % of the pristine one.

中文翻译：

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基于过氧-2-乙基己酸叔丁酯改性空穴传输层的稳定高效钙钛矿太阳能电池


如今，钙钛矿太阳能电池（PSC）作为最有前途的新能源技术之一而受到广泛关注。然而，spiro-OMeTAD这种高效有机空穴传输材料（HTM）在PSC中的应用由于其固有的导电性和空穴迁移率弱点而受到限制。在此，引入自由基引发剂过氧-2-乙基己酸叔丁酯（TBPEH）来诱导 Spiro 快速且可控的氧化。 TBPEH 改性空穴传输层 (HTL) 会产生更多自由基阳离子，从而提高载流子迁移率和电导率。改性 HTL 的更光滑表面提高了电荷传输效率。此外，TBPEH 修饰器件的陷阱态密度和缺陷引起的非辐射复合也有所降低。此外，HTL 和钙钛矿层之间更好的能级匹配可以实现更高效的空穴传输。因此，掺杂 TBPEH 的 PSC 实现了 24.33% 的冠军功率转换效率 (PCE)，超过了原始器件 21.72% 的 PCE。此外，TBPEH修饰的器件表现出更好的稳定性。在相对湿度为 30% 的大气中储存 42 天后，经过 TBPEH 改进的器件仍保持着 90.8% 的最高效率，而原始器件的最高效率为 73.8%。