Abstract：
Wide bandgap (WBG) perovskite can construct tandem cells with narrow bandgap solar cells by adjusting the band gap to overcome the Shockley-Queisser limitation of single junction perovskite solar cells (PSCs). However, WBG perovskites still suffer from severe nonradiative carrier recombination and large open-circuit voltage loss. Here, this work uses an in situ photoluminescence (PL) measurement to monitor the intermediate phase evolution and crystallization process via blade coating. This work reports a strategy to fabricate efficient and stable WBG perovskite solar cells through doping a long carbon chain molecule octane-1,8-diamine dihydroiodide (ODADI). It is found that ODADI doping not only suppresses intermediate phases but also promote the crystallization of perovskite and passivate defects in blade coated 1.67 eV WBG FA0.7Cs0.25MA0.05Pb(I0.8Br0.2)3 perovskite films. As a result, the champion single junction inverted PSCs deliver the efficiencies of 22.06% and 19.63% for the active area of 0.07 and 1.02 cm2, respectively, which are the highest power conversion efficiencies (PCEs) in WBG PSCs by blade coating. The unencapsulated device demonstrates excellent stability in air, which maintains its initial efficiency at the maximum power points under constant AM 1.5G illumination in open air for nearly 500 h. The resulting semitransparent WBG device delivers a high PCE of 20.06%, and the 4-terminal all-perovskite tandem device delivers a PCE of 28.35%.
摘要：
宽带隙(WBG)钙钛矿可以通过调整带隙以克服单结钙钛矿太阳能电池(PSC)的Shockley-Queisser限制来构建具有窄带隙太阳能电池的串联电池。然而,WBG钙钛矿仍然遭受严重的非辐射载流子复合和大的开路电压损失。这里,我们使用原位光致发光（PL）测量来监测中间相的演变和结晶过程通过刀片涂层。我们报告了一种通过掺杂长碳链分子辛烷-1,8-二胺二氢碘化物（ODADI）来制造高效且稳定的WBG钙钛矿太阳能电池的策略。我们发现，ODADI掺杂不仅抑制了中间相，而且促进了刀片涂覆的1.67eVWBGFA0.7Cs0.25MA0.05Pb（I0.8Br0.2）3钙钛矿薄膜中钙钛矿的结晶和钝化缺陷。因此,冠军单结反向PSC提供的效率为22.06%和19.63%的0.07cm2和1.02cm2的有效面积，分别,通过刀片涂覆，这是WBGPSC中最高的PCE。未封装的器件在空气中表现出优异的稳定性，在恒定的AM1.5G照明下，在露天近500小时内保持其初始效率在最大功率点。所得的半透明WBG装置提供20.06%的高PCE，4端全钙钛矿串联器件的PCE为28.35%。本文受版权保护。保留所有权利。
