维普中文期刊产品整合服务

MA Cation-Induced Diffusional Growth of Low-Bandgap FA-Cs Perovskites Driven by Natural Gradient Annealing

查看全文 作　　者：Taiyang [1]Zhang;Yuetian [1]Chen;Miao [1]Kan;Shumao [1]Xu;Yanfeng [1]Miao;Xingtao [1]Wang;Meng [1]Ren;Haoran [1]Chen;Xiaomin [1]Liu;Yixin [1,2]Zhao 高影响力作者 机构地区：[1]School of Environmental Science and Engineering,Shanghai Jiao Tong University,800 Dongchuan Rd.,Shanghai 200240,China;[2]Shanghai Institute of Pollution Control and Ecological Security,Shanghai 200240,China高影响力机构 出　　处：《Research》索引2021年第1期,共11页高影响力期刊 基　　金：support of the NSFC(Grant Nos.22025505 and 21777096);Program of Shanghai Academic/-Technology Research Leader(Grant No.20XD1422200);Cultivating fund of Frontiers Science Center for Transformative Molecules(2019PT02);TZ acknowledges the support of the Initiative Postdocs Supporting Program(Grant No.BX20180185);China Postdoctoral Science Foundation(Grant No.2018M640387)。 摘　　要：Low-bandgap formamidinium-cesium(FA-Cs)perovskites of FA_(1-x)CsxPbI_(3)(x<0:1)are promising candidates for efficient and robust perovskite solar cells,but their black-phase crystallization is very sensitive to annealing temperature.Unfortunately,the low heat conductivity of the glass substrate builds up a temperature gradient within from bottom to top and makes the initial annealing temperature of the perovskite film lower than the black-phase crystallization point(~150℃).Herein,we take advantage of such temperature gradient for the diffusional growth of high-quality FA-Cs perovskites by introducing a thermally unstable MA^(+)cation,which would firstly formα-phase FA-MA-Cs mixed perovskites with low formation energy at the hot bottom of the perovskite films in the early annealing stage.The natural gradient annealing temperature and the thermally unstable MA^(+)cation then lead to the bottom-to-top diffusional growth of highly orientatedα-phase FA-Cs perovskite,which exhibits 10-fold of enhanced crystallinity and reduced trap density(~3:85×10^(15) cm^(−3)).Eventually,such FA-Cs perovskite films were fabricated into stable solar cell devices with champion efficiency up to 23.11%,among the highest efficiency of MA-free perovskite solar cells. 关 键 词：temperature ANNEALING PEROVSKITE
相关文献

参考文献(52)

引证文献(2)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费