水系合成δ相甲脒铅碘钙钛矿粉末  

Aqueously synthesizedδ-phase FAPbI_(3) for efficient perovskite solar cells

作　　者：潘逸宁 王镛皓 邓明欣 曾强 李林鸿 廖响 张茗珺 王伟 谢锋 刘芳洋 Yining Pan;Yonghao Wang;Mingxin Deng;Qiang Zeng;Linhong Li;Xiang Liao;Mingjun Zhang;Wei Wang;Feng Xie;Fangyang Liu(School of Metallurgy and Environment,Central South University,Changsha,410083,China;School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan,430070,China;Department of Research and Development,Zhejiang Yitai Technology Co.Ltd.,Changsha,410205,China;Advanced Battery Materials Engineering Research Center of the Ministry of Education,Changsha,410083,China;School of Metallurgy,Northeastern University,Shenyang,110819,China;National Energy Metal Resources and New Materials Key Laboratory,Changsha,410083,China)

机构地区：[1]School of Metallurgy and Environment,Central South University,Changsha,410083,China [2]School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan,430070,China [3]Department of Research and Development,Zhejiang Yitai Technology Co.Ltd.,Changsha,410205,China [4]Advanced Battery Materials Engineering Research Center of the Ministry of Education,Changsha,410083,China [5]School of Metallurgy,Northeastern University,Shenyang,110819,China [6]National Energy Metal Resources and New Materials Key Laboratory,Changsha,410083,China

出　　处：《Science China Materials》2024年第5期1621-1630,共10页中国科学（材料科学）（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(2022YFB3803300);the Natural Science Foundation of Hunan Province of China(2021JJ10058);the Major Scientific and Technological Project of Changsha in 2022(kq2301002)。

摘　　要：近年来,甲脒基钙钛矿太阳能电池的光电转换效率取得了显著进展,其商业化前景日益明朗.随着钙钛矿电池商业化的快速发展,对于环境友好、成本低廉的钙钛矿前驱体的需求不断增长.甲脒铅碘钙钛矿材料遇水易分解,因此传统钙钛矿粉末合成方法依赖于有机溶剂和惰性气氛手套箱,不具备成本优势.在此背景下,本文提出了一种经济高效的水系合成高纯度δ相甲脒铅碘(δ-FAPbI_(3))粉末的策略.在水溶液中加入过量氢碘酸,碘离子可使不溶性PbI_(2)转化为可溶性[PbI_(2)+n]n-络合物,将FAPbI_(3)的遇水分解转化为溶解,从而使水系合成成为可能.水系合成的甲脒铅碘粉末具有高纯度、低成本优势,可作为钙钛矿薄膜前驱体材料.与以PbI_(2)和FAI的混合物作为前驱体制备的钙钛矿薄膜相比,以水系合成的δ-FAPbI_(3)粉末为前驱体制备的钙钛矿薄膜具有良好的结晶性,降低了缺陷密度,并有效抑制了有害的离子输运和降解过程,从而增强了载流子传输性能和电池稳定性.在环境空气中以合成粉末为前驱体制备的钙钛矿太阳能电池,最高转化效率可达23.24%.The notable advancements in boosting the power conversion efficiency(PCE)of formamidinium-based perovskite solar cells are progressively underscoring their commercialization potential.A fundamental requirement for the commercialization of perovskite photovoltaics is the establishment of an environmentally friendly synthesis approach capable of facilitating large-scale production.Conventionally,the manufacturing of this moisture-sensitive material depends on organic solvents and a glove box,a practice that is scarcely embraced by the industry.In this context,a cost-effective aqueous wet-chemical strategy was developed to synthesize stoichiometricδ-phase formamidinium lead triiodide(δ-FAPbI_(3))powder,which serves as a high-purity precursor for perovskite film deposition.Benefit from the presence of a high concentration of iodine in the aqueous solution,the insoluble PbI_(2)transforms into soluble[PbI_(2)+n]n-complexes,converting the decomposition of FAPbI_(3)into dissolution,and the aqueous synthesis becomes available.By utilizing synthesizedδ-FAPbI_(3)powder,we promoted favorable crystallization in resulting perovskite films,which enhanced carrier transport properties and stability.Compared with perovskite films prepared by a mixture of PbI_(2)and FAI as precursors,films by synthesized powder showcase preferred crystal orientation,and reduced trap densities,and effectively suppress detrimental ion transport and degradation processes.Consequently,we fabricated perovskite solar cells based on this synthesized powder in ambient air and achieved a maximum PCE of 23.24%.

关 键 词：perovskite microcrystal powder aqueous synthesis perovskite solar cells 

分 类 号：TB383.3[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]