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Carbohydrazide-Assisted Morphology and Structure Controlling for Lead-Free Cs2AgBiBr6 Double Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-07-24 , DOI: 10.1021/acsami.3c06149 Yunhao Fan 1 , Feiyang Qiao 1 , Daxue Du 1 , Jiahao Bao 1 , JingJing Liang 1 , Hong Liu 1 , Wenzhong Shen 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-07-24 , DOI: 10.1021/acsami.3c06149 Yunhao Fan 1 , Feiyang Qiao 1 , Daxue Du 1 , Jiahao Bao 1 , JingJing Liang 1 , Hong Liu 1 , Wenzhong Shen 1
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The stability and toxicity problems have haunted the development and applications of metal halide perovskite materials, for which the lead-free inorganic double perovskite Cs2AgBiBr6 has emerged as a promising substitute in recent years. However, poor film quality has severely limited its photovoltaic performance that could have been induced by some key factors such as high annealing temperature. Herein, we present a facile strategy to fabricate high-quality pinhole-free Cs2AgBiBr6 films with large grain sizes by introducing carbohydrazide (CBH) into the precursor. Detailed characterizations have shown that the carbonyl group (C═O) in CBH plays the critical role in coordinating with Ag+ and Bi3+ cations during the film formation process. As another consequence, the as-fabricated devices have exhibited significantly higher reproducibility for fabrication. By optimizing the amount of CBH, the power conversion efficiency (PCE) relatively increased 37 to 1.57%, which remained 95.0% in an ambient environment for a 1000-h test. Hopefully, this work could facilitate the current technologies in the exploration of high-performance lead-free perovskites such as Cs2AgBiBr6 and better understanding of the mechanism in the additive engineering as well.
中文翻译：
碳酰肼辅助无铅 Cs2AgBiBr6 双钙钛矿太阳能电池的形貌和结构控制
稳定性和毒性问题一直困扰着金属卤化物钙钛矿材料的开发和应用，无铅无机双钙钛矿Cs 2 AgBiBr 6近年来已成为其有前景的替代品。然而，薄膜质量差严重限制了其光伏性能，这可能是由高退火温度等一些关键因素引起的。在此，我们提出了一种简单的策略，通过在前驱体中引入碳酰肼（CBH）来制备高品质、大晶粒尺寸的无针孔Cs 2 AgBiBr 6薄膜。详细表征表明，CBH中的羰基(C=O)在成膜过程中与Ag +和Bi 3+阳离子配位起着关键作用。另一个结果是，所制造的器件表现出明显更高的制造再现性。通过优化CBH的量，功率转换效率（PCE）相对提高了37%至1.57%，在周围环境下进行1000小时测试时仍保持在95.0%。希望这项工作能够促进当前技术对高性能无铅钙钛矿（如 Cs 2 AgBiBr 6 ）的探索，并更好地理解增材工程的机理。
更新日期：2023-07-24
中文翻译：
碳酰肼辅助无铅 Cs2AgBiBr6 双钙钛矿太阳能电池的形貌和结构控制
稳定性和毒性问题一直困扰着金属卤化物钙钛矿材料的开发和应用，无铅无机双钙钛矿Cs 2 AgBiBr 6近年来已成为其有前景的替代品。然而，薄膜质量差严重限制了其光伏性能，这可能是由高退火温度等一些关键因素引起的。在此，我们提出了一种简单的策略，通过在前驱体中引入碳酰肼（CBH）来制备高品质、大晶粒尺寸的无针孔Cs 2 AgBiBr 6薄膜。详细表征表明，CBH中的羰基(C=O)在成膜过程中与Ag +和Bi 3+阳离子配位起着关键作用。另一个结果是，所制造的器件表现出明显更高的制造再现性。通过优化CBH的量，功率转换效率（PCE）相对提高了37%至1.57%，在周围环境下进行1000小时测试时仍保持在95.0%。希望这项工作能够促进当前技术对高性能无铅钙钛矿（如 Cs 2 AgBiBr 6 ）的探索，并更好地理解增材工程的机理。
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