Grain enlargement and defect passivation with melamine additive for high efficiency and stable CsPbBr3 perovskite solar cells.,ChemSusChem

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Grain enlargement and defect passivation with melamine additive for high efficiency and stable CsPbBr3 perovskite solar cells.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-01-23 , DOI: 10.1002/cssc.201903288
Jingwei Zhu ₁ , Benlin He ₁ , Zekun Gong ₁ , Yang Ding ₁ , Wenyu Zhang ₁ , Xueke Li ₁ , Zhihao Zong ₁ , Haiyan Chen ₁ , Qunwei Tang _{2,

3}

Affiliation

The preparation of high-quality perovskite films with low grain boundaries and defect states is a prerequisite for achieving high-efficiency perovskite solar cells (PSCs) with good environmental stability. In this work, an effective additive engineering for simultaneous defect passivation and crystal growth of CsPbBr3 perovskite films by introducing 1,3,5-Triazine-2,4,6-triamine (melamine) into PbBr2 precursor solution is reported. Arising from the positive effect of the formed melamine-PbBr2 film with loose large-grained structure and decreased crystallinity on the crystallization process of perovskite, the retardation of perovskite crystallization rate caused by the interaction between melamine and lead ions and the passivation of melamine, the high-quality CsPbBr3 perovskite film with lower grain boundaries as well as defect densities and better energy level matching is fabricated by multi-step liquid phase spin-coating technology, which greatly suppresses the non-radiative recombination resulted from the defects and promotes the charge extraction at the interface. A champion power conversion efficiency as high as 9.65% with an attractive open-circuit voltage of 1.584 V is achieved for PSCs with an architecture of FTO/c-TiO2/m-TiO2/melamine-added CsPbBr3/carbon free of hole-transporting layers. Furthermore, the encapsulated-free melamine-added CsPbBr3 PSC shows a superior thermal and humidity stability in ambient air with 85°C or 85% RH over 720 h.

中文翻译：

三聚氰胺添加剂可实现晶粒扩大和缺陷钝化，从而获得高效且稳定的CsPbBr3钙钛矿型太阳能电池。

具有低晶界和缺陷态的高质量钙钛矿薄膜的制备是获得具有良好环境稳定性的高效钙钛矿太阳能电池（PSC）的前提。在这项工作中，通过向PbBr2前体溶液中引入1,3,5-三嗪-2,4,6-三胺（三聚氰胺），报道了一种有效的添加剂工程，用于同时进行CsPbBr3钙钛矿薄膜的钝化和晶体生长。由于所形成的三聚氰胺-PbBr2薄膜具有松散的大晶粒结构和结晶度降低对钙钛矿结晶过程的积极影响，是由于三聚氰胺与铅离子之间的相互作用以及三聚氰胺的钝化导致钙钛矿结晶速率的延迟，通过多步液相旋涂技术制备了具有较低晶界，缺陷密度和更好的能级匹配的高质量CsPbBr3钙钛矿薄膜，极大地抑制了由缺陷引起的非辐射复合并促进了电荷的产生在接口处提取。具有FTO / c-TiO2 / m-TiO2 /三聚氰胺的CsPbBr3 /无碳结构的PSC的PSC可获得高达9.65％的最高功率转换效率和1.584 V的有吸引力的开路电压。此外，无封装的添加三聚氰胺的CsPbBr3 PSC在720小时内在85°C或85％RH的环境空气中显示出优异的热稳定性和湿度稳定性。这极大地抑制了由缺陷引起的非辐射复合，并促进了界面处的电荷提取。具有FTO / c-TiO2 / m-TiO2 /三聚氰胺的CsPbBr3 /无碳结构的PSC的PSC可获得高达9.65％的最高功率转换效率和1.584 V的有吸引力的开路电压。此外，无封装的添加三聚氰胺的CsPbBr3 PSC在720小时内在85°C或85％RH的环境空气中显示出优异的热稳定性和湿度稳定性。这极大地抑制了由缺陷引起的非辐射复合，并促进了界面处的电荷提取。具有FTO / c-TiO2 / m-TiO2 /三聚氰胺的CsPbBr3 /无碳结构的PSC的PSC可获得高达9.65％的最高功率转换效率和1.584 V的有吸引力的开路电压。此外，无封装的添加三聚氰胺的CsPbBr3 PSC在720小时内在85°C或85％RH的环境空气中显示出优异的热稳定性和湿度稳定性。

更新日期：2020-03-05

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