题目：Enhancing photovoltaically preferred orientation in wide-bandgap perovskite for efficient all-perovskite tandem solar cells
作者：Zhanghao Wua, Yue Zhao a, Changlei Wang a,*, Tianshu Ma a,*, Chen Chen a, Yuhui Liu a, Tianci Jia a, Yuhang Zhai a, Cong Chen b, Cheng Zhang a, Guogyang Cao a, Zhenhai Yang a,, Dewei Zhao b,*, Xiaofeng Li a,*
单位：
a School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
b College of Materials Science and Engineering & Institute of New Energy and Low-Carbon Technology, Engineering Research Center of Alternative Energy Materials & Devices of Ministry of Education, Sichuan University, Chengdu 610065, China
摘要：Wide-bandgap perovskite solar cells (WBG PSCs) have promise applications in tandem devices, yet suffer from low open-circuit voltages (VOCs) and less stability. To address these issues, this study introduces multifunctional nicotinamide derivatives into WBG PSCs, leveraging the regulation on photovoltaically preferential orientation and optoelectronic properties via diverse functional groups, e.g., carbonyl, amino. Isonicotinamide (IA) molecule emerges as the most effective agent, enhancing crystallization kinetics and defect passivation due to its unique planar spatial configuration. Incorporating IA into WBG perovskites improves the (100) preferred crystal orientation, reduces trap density, and enables well-matched energy band alignment. High-performance 1.77 eV WBG PSCs are achieved with a champion power conversion efficiency of 19.34% and a VOC of 1.342 V, leading to the fabrication of our best-performing all-perovskite tandem solar cell with a PCE of 28.53% (certified 28.27%) and excellent operational stability, maintaining over 90% of the initial efficiency under 1 sun illumination for 600 hours.
宽带隙钙钛矿太阳能电池在叠层器件中具有良好的应用前景，但存在开路电压低和稳定性较差的问题。本研究将多功能烟酰胺衍生物引入宽带隙钙钛矿太阳能电池，利用羰基、氨基等多种功能基团调控晶体择优取向和光电特性。其中，异烟酰胺（IA）分子的调控效果最佳，这是由于其独特的平面空间结构，可增强结晶动力学和缺陷钝化。将IA掺入宽带隙钙钛矿中可改善(100)晶面的择优取向，降低缺陷态密度，并实现匹配良好的能带排列。本研究实现了高效的1.77 eV宽带隙钙钛矿太阳能电池，其转换效率达到19.34%，开路电压为1.342 V，以此制备的全钙钛矿叠层太阳能电池，最佳效率为28.53%（认证效率为28.27%）。优化后的叠层电池展现出优异的运行稳定性，在经受600小时的一个太阳光照强度测试后，仍能维持其初始效率的90%。
影响因子：27.4
链接：//onlinelibrary.wiley.com/doi/10.1002/adma.202412943