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基于大气环境下全无机钙钛矿薄膜及碳基太阳能电池的组分调控和添加剂工程

仲婷婷 郝会颖

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基于大气环境下全无机钙钛矿薄膜及碳基太阳能电池的组分调控和添加剂工程

仲婷婷, 郝会颖

Component control and additive engineering of all-inorganic perovskite films and carbon-based solar cells based on ambient air environment

Zhong Ting-ting, Hao Hui-ying
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  • 全无机CsPbX3材料作为一种新型的钙钛矿材料应用于太阳能电池具有生产高效、稳定的商用器件的潜在前景,但由空穴传输材料和贵金属电极所带来的成本和稳定性问题却亟需解决,由此基于无空穴传输层结构(HTL-free)的全无机体系的碳基钙钛矿太阳能电池(C-PSCs)引起了广泛关注。本文通过精细调控X位卤素阴离子中I和Br的比例,基于一步反溶剂法,在大气环境下制备CsPbIxBr3-x薄膜和HTL-free C-PSCs,找到兼顾效率和稳定的平衡点。之后,为进一步提高相应器件的性能,将苯乙基溴化胺(PEABr)引入钙钛矿中,最终基于PEABr处理后的钙钛矿薄膜具有更好的结晶度以及更低的缺陷态密度,而生成少量二维钙钛矿能够钝化钙钛矿薄膜,并抑制载流子的非辐射复合。通过适量PEABr处理后,器件的光电转换效率(PCE)显著增强,从对照组最佳器件的10.18%提高到12.61%。由此,该方法为大气环境下制备高效率、低成本的HTL-free C-PSCs提供了优化思路。
    The new all-inorganic CsPbX3 perovskite material is expected to be used as an absorbing layer to prepare solar cells for efficient and stable commercial devices. However, the high cost and poor stability issues caused by hole transport materials and precious metal electrodes urgently need to be addressed. Therefore, carbon-based perovskite solar cells (C-PSCs) based on the HTL-free all-inorganic system have attracted widespread attention. This article adopts a strategy of finely regulating the ratio of I and Br in X-site of perovskite. Based on the one-step anti-solvent method, CsPbIxBr3-x films and HTL-free C-PSCs were prepared under ambient air conditions. By comparing their light absorption characteristics, carrier transport, and corresponding optoelectronic properties, a balance point between efficiency and stability was found. Finally, HTL-free C-PSCs achieved the best efficiency of 10.10 % and could be stably prepared under ambient air environments. Afterwards, in order to further improve the performance of the corresponding devices, phenylethylammonium bromide (PEABr) was introduced into the perovskite. And compare the crystallinity, carrier transport, defect situation, and corresponding optoelectronic properties of perovskite films and devices under different conditions. Ultimately, the perovskite film treated with PEABr had better crystallinity and lower defect density, while generating a small amount of two-dimensional perovskite could passivate the perovskite film and suppress non-radiative recombination of charge carriers. After appropriate PEABr treatment, the photoelectric conversion efficiency (PCE) of the device was significantly enhanced, increasing from 10.18 % of the optimal device in the control group to 12.61 %. Thus, this method provides an optimization approach for the preparation of efficient and low-cost HTL-free C-PSCs under ambient air environments.
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