Jia Peng, Chen Guoyi, Li Guang, Liang Jiwei, Guan Hongling, Wang Chen, Pu Dexin, Ge Yansong, Hu Xuzhi, Cui Hongsen, Du Shengjie, Liang Chao, Liao Jinfeng, Xing Guichuan, Ke Weijun, Fang Guojia
Key Lab of Artificial Micro- and Nano-Structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, P. R. China.
School of Electronic and Electrical Engineering, Wuhan Textile University, Wuhan, 430200, P. R. China.
Adv Mater. 2024 Jun;36(25):e2400105. doi: 10.1002/adma.202400105. Epub 2024 Mar 17.
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 FACsMAPb(IBr) 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 cm, 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%.
宽带隙（WBG）钙钛矿可以通过调整带隙与窄带隙太阳能电池构建串联电池，以克服单结钙钛矿太阳能电池（PSC）的肖克利-奎塞尔限制。然而，WBG钙钛矿仍然存在严重的非辐射载流子复合和较大的开路电压损失。在此，这项工作使用原位光致发光（PL）测量通过刮刀涂布来监测中间相演变和结晶过程。这项工作报道了一种通过掺杂长碳链分子1,8-二氨基辛烷二氢碘化物（ODADI）来制造高效且稳定的WBG钙钛矿太阳能电池的策略。研究发现，ODADI掺杂不仅抑制中间相，还促进钙钛矿的结晶，并钝化刮刀涂布的1.67 eV WBG FACsMAPb(IBr)钙钛矿薄膜中的缺陷。结果，对于0.07和1.02 cm²的有源面积，冠军单结倒置PSC的效率分别为22.06%和19.63%，这是通过刮刀涂布在WBG PSC中实现的最高功率转换效率（PCE）。未封装的器件在空气中表现出优异的稳定性，在露天恒定AM 1.5G光照下最大功率点处保持其初始效率近500小时。所得的半透明WBG器件实现了20.06%的高PCE，四端全钙钛矿串联器件的PCE为28.35%。
