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Spiro[cyclopentadithiophene-dioxolane]-Based D–A–D Type Organic Molecule for Both Crystallization Improvement and Band Adjustment of Perovskites
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-03 , DOI: 10.1021/acsami.1c21041
Yulin Tan 1 , Yang Zhao 1 , Li Wan 1 , Lingyun Lou 1 , Zhong-Sheng Wang 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-01-03 , DOI: 10.1021/acsami.1c21041
Yulin Tan 1 , Yang Zhao 1 , Li Wan 1 , Lingyun Lou 1 , Zhong-Sheng Wang 1
Affiliation
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To improve the crystallization and meanwhile adjust the band levels of perovskites, we design and synthesize a novel organic molecule, 4,4′-(spiro[cyclopenta[1,2-b:5,4-b′]dithiophene-4,2′-[1,3]dioxolane]-2,6-diyl)bis(N,N-bis(4-methoxyphenyl)aniline) (TM1), to dissolve in an antisolvent for the antisolvent engineering of perovskite solar cells (PSCs). The coordination interactions between TM1 and Pb2+ ions in perovskites and the hydrogen bonds between the O atoms in the methoxy of TM1 and the MA+ in perovskites are characterized with X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Owing to these interactions, TM1 can improve the perovskite crystallization, which reduces the trap density, enhances the interfacial hole extraction, and retards charge recombination as well, boosting short-circuit photocurrent notably. TM1 also shifts the valence band of perovskites upward by 0.17 eV, which aligns better with the highest occupied molecular orbital of hole transport materials and thus increases the open-circuit photovoltage significantly. As a result, the power conversion efficiency is enhanced from 17.22 to 20.21% by TM1. Moreover, TM1 can also improve device stability significantly. These findings demonstrate that TM1 is a kind of functional material as an additive in an antisolvent for both crystallization improvement and energy level adjustment of perovskites toward highly efficient and stable PSCs.
中文翻译:
螺[环戊二噻吩-二氧戊环]-基D-A-D型有机分子用于钙钛矿的结晶改善和谱带调整
为了改善钙钛矿的结晶并同时调整能带水平,我们设计并合成了一种新型有机分子 4,4'-(spiro[cyclopenta[1,2- b :5,4- b ']dithiophene-4,2 '-[1,3]dioxolane]-2,6-diyl)bis( N , N -bis(4-methoxyphenyl)aniline) (TM1),溶解在反溶剂中,用于钙钛矿太阳能电池 (PSC) 的反溶剂工程. 钙钛矿中TM1与Pb 2+离子的配位作用以及TM1甲氧基中O原子与MA +之间的氢键通过 X 射线光电子能谱和傅里叶变换红外光谱对钙钛矿中的钙钛矿进行表征。由于这些相互作用,TM1可以改善钙钛矿结晶,从而降低陷阱密度,增强界面空穴提取,并延缓电荷复合,显着提高短路光电流。TM1还将钙钛矿的价带向上移动0.17 eV,与空穴传输材料的最高占据分子轨道更好地对齐,从而显着提高了开路光电压。因此,TM1 将功率转换效率从 17.22% 提高到 20.21%。此外,TM1 还可以显着提高器件的稳定性。
更新日期:2022-01-12
中文翻译:
![](https://scdn.x-mol.com/jcss/images/paperTranslation.png)
螺[环戊二噻吩-二氧戊环]-基D-A-D型有机分子用于钙钛矿的结晶改善和谱带调整
为了改善钙钛矿的结晶并同时调整能带水平,我们设计并合成了一种新型有机分子 4,4'-(spiro[cyclopenta[1,2- b :5,4- b ']dithiophene-4,2 '-[1,3]dioxolane]-2,6-diyl)bis( N , N -bis(4-methoxyphenyl)aniline) (TM1),溶解在反溶剂中,用于钙钛矿太阳能电池 (PSC) 的反溶剂工程. 钙钛矿中TM1与Pb 2+离子的配位作用以及TM1甲氧基中O原子与MA +之间的氢键通过 X 射线光电子能谱和傅里叶变换红外光谱对钙钛矿中的钙钛矿进行表征。由于这些相互作用,TM1可以改善钙钛矿结晶,从而降低陷阱密度,增强界面空穴提取,并延缓电荷复合,显着提高短路光电流。TM1还将钙钛矿的价带向上移动0.17 eV,与空穴传输材料的最高占据分子轨道更好地对齐,从而显着提高了开路光电压。因此,TM1 将功率转换效率从 17.22% 提高到 20.21%。此外,TM1 还可以显着提高器件的稳定性。