In-situ Growth of Conformal SnO_(2) Layers for Efficient Perovskite Solar Cells  

原位生长钙钛矿太阳能电池共形氧化锡薄膜

作　　者：LIU Suolan LUAN Fuyuan WU Zihua SHOU Chunhui XIE Huaqing YANG Songwang 刘锁兰;栾福园;吴子华;寿春晖;谢华清;杨松旺(中国科学院上海硅酸盐研究所,中国科学院能量转换材料重点实验室,上海201899;中国科学院大学材料科学与光电工程中心,北京100049;上海第二工业大学能源与材料学院,上海201209;上海先进热功能材料工程技术研究中心,上海201209;浙江省白马湖实验室有限公司,杭州310000)

机构地区：[1]CAS Key Laboratory of Materials for Energy Conversion,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Energy and Materials,Shanghai Polytechnic University,Shanghai 201209,China [4]Shanghai Engineering Research Center of Advanced Thermal Functional Materials,Shanghai 201209,China [5]Zhejiang Baima Lake Laboratory Co.Ltd.,Hangzhou 310000,China

出　　处：《无机材料学报》2024年第12期1397-1403,I0009,共8页Journal of Inorganic Materials

基　　金：Space Application System of China Manned Space Program。

摘　　要：Significant progress has recently been made in enhancing the power conversion efficiency(PCE)of perovskite solar cells(PSCs).The electron transport layer(ETL),as an essential component of PSCs,significantly influences the performance of devices.Traditional spin-coating method for preparing the ETL fails to fully cover the cusp of FTO transparent conductive glass substrate,leading to direct contact between perovskite film and FTO substrate,which induces charge recombination and reduces the performance of PSCs.To address this issue,an in-situ growth method was proposed to prepare conformal SnO_(2) films on FTO glass substrates in this study.The resulting SnO_(2) films are not only dense and uniform,fully covering the cusp of the FTO glass substrates and reducing the contact area between the FTO substrates and the perovskite films,but also facilitating the formation of perovskite films with large grain sizes.Moreover,the conformal SnO_(2) films can improve the charge extraction at the SnO_(2)/perovskite interface,reduce the trap density and trap-assisted recombination in PSCs,and thus enhance the PCE of PSCs.Through comparative experiments,it is found that the PSCs with in-situ grown SnO_(2) films show an improved PCE of 21.97%,which significantly increased compared to that with spin-coated SnO_(2) films(20.93%).All above data demonstrate that the as-prepared SnO_(2) film can serve as an ideal ETL.It is worth mentioning that this method avoids the use of corrosive hydrochloric acid and toxic thioglycolic acid,and it can also be extended to ITO flexible transparent conductive substrates in the future.近年来,钙钛矿太阳能电池(PSCs)的光电转换效率(PCE)取得了重要进展,其中,电子传输层作为重要组成部分,对PSCs的性能有显著影响。传统旋涂法制备的电子传输层(ETL)难以完全覆盖FTO透明导电衬底尖端,使得钙钛矿薄膜与FTO衬底直接接触,导致电荷复合,PSCs性能降低。针对这一问题,本研究提出了一种原位生长方法,在FTO玻璃衬底上制备共形的SnO_(2)薄膜。所得SnO_(2)薄膜不仅致密均匀,而且能够覆盖FTO玻璃衬底尖端,降低FTO衬底与钙钛矿薄膜的接触面积,使在其上制备的钙钛矿薄膜具有更大的晶粒尺寸。此外,共形的SnO_(2)薄膜还能促进SnO_(2)/钙钛矿界面电荷的有效提取,降低PSCs的陷阱密度,抑制陷阱辅助的电荷复合,从而提升PSCs的PCE。对比实验发现,当PSCs采用原位生长SnO_(2)薄膜时,其PCE提升至21.97%,相较于采用旋涂法制备的SnO_(2)薄膜(20.93%)有了明显提升,表明原位生长SnO_(2)薄膜可用作理想的ETL。值得一提的是,由于原位生长SnO_(2)方法无需添加具有强腐蚀性的盐酸和有毒的巯基乙酸,未来亦可扩展应用于不耐腐蚀的ITO柔性透明导电衬底。

关 键 词：perovskite solar cell conformal SnO_(2)film in-situ growth 

分 类 号：TQ174[化学工程—陶瓷工业]