Abstract
All-inorganic CsPbBr3 perovskite solar cells (PSCs) are promising candidates to balance the stability and efficiency issues of organic-inorganic hybrid devices. However, the large energy barrier for charge transfer and narrow spectral response are still two challenging problems for performance improvement. We present here an organic bulk-heterojunction {poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl C61 butyric acid methyl ester (P3HT: PCBM)} photoactive layer to boost the charge extraction and to widen the spectral absorption, achieving an enhanced power conversion efficiency up to 8.94% by optimizing the thickness of P3HT: PCBM photoactive layer, which is much higher than 6.28% for the pristine CsPbBr3 device. The interaction between the carbonyl group in PCBM and unsaturated Pb atom in the perovskite surface can effectively passivate the defects and reduce charge recombination. Furthermore, the coupling effect between PCBM and P3HT widens the spectral response from 540 to 650 nm for an increased short-circuit current density. More importantly, the devices are relatively stable over 75 days upon persistent attack by 70% relative humidity in air condition. These advantages of high efficiency, excellent long-term stability, cost-effectiveness and scalability may promote the commercialization of inorganic PSCs.
摘要
全无机CsPbBr3 钙钛矿太阳能电池能够很好地平衡传统杂化 器件的效率和稳定性问题. 然而, 较大的电荷传输势垒以及较窄的 吸光范围已经成为限制器件效率进一步提升的两大挑战. 本文通 过构建有机体相异质结(P3HT:PCBM光活性层)加速器件电荷提取 并扩宽吸光范围, 通过进一步优化P3HT:PCBM光活性层的厚度, 获 得了8.94%的光电转换效率, 远高于单一CsPbBr3 作为吸光层的电池 效率(6.28%). 通过系统的测试表征发现PCBM中的羰基与钙钛矿 表面未饱和的铅原子相互作用能够有效地钝化缺陷态, 减小器件 的复合反应. 另外, PCBM和P3HT之间的相互耦合将器件的吸光范 围扩宽至650 nm, 能够在不降低电池开路电压的前提下增加光生 载流子的数量, 提高电池器件的短路电流. 尤为重要的是, 器件在 70%相对湿度下存放75天仍能保持相对稳定. 高效、稳定、可大规 模制备的优势能够加速无机钙钛矿太阳能电池的商业化进程.
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Acknowledgements
This work was supported by the Fundamental Research Funds for the Central Universities (21620348 and 21618409), the National Natural Science Foundation of China (61774139, U1802257), and the Natural Science Foundation of Guangdong Province (2019B151502061).
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Duan J and Tang Q designed the study; Du J and Duan Y performed the experiments; Duan J and Tang Q wrote the paper. All authors contributed to the general discussion.
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Jian Du received his PhD degree in the fields of electrochemistry from Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences in 2019. Currently, he is a Postdoctoral Researcher in the College of Information Science and Technology at Jinan University (Guangzhou, China). His research interests focus on perovskite materials, inorganic nanomaterials and their applications in photovoltaic devices and triboelectric nanogenerators for sustainable and clean energy.
Jialong Duan received his PhD degree from Ocean University of China in 2019. After graduation, he became an Associate Professor in the College of Information Science and Technology at Jinan University (Guangzhou, China). His research interests focus on the all-inorganic perovskite solar cells, dye-sensitized solar cells and nanogenerators.
Qunwei Tang is a full Professor in the College of Information Science and Technology at Jinan University (Guangzhou, China). After receiving his PhD at Huaqiao University in 2009, he joined Strasbourg University and the University of South Carolina as a postdoctoral fellow. He joined Ocean University of China in 2012 and moved to Jinan University in 2018. His research interests cover inorganic perovskite solar cells and triboelectric nanogenerators.
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Du, J., Duan, J., Duan, Y. et al. Tailoring organic bulk-heterojunction for charge extraction and spectral absorption in CsPbBr3 perovskite solar cells. Sci. China Mater. 64, 798–807 (2021). https://doi.org/10.1007/s40843-020-1499-8
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DOI: https://doi.org/10.1007/s40843-020-1499-8