钙钛矿(结构)
材料科学
载流子
三卤化物
电子
千分尺
兴奋剂
卤化物
化学物理
光电效应
化学
吸收(声学)
光学
光电子学
扩散
纳米技术
物理
结晶学
无机化学
热力学
复合材料
量子力学
作者
Samuel D. Stranks,Giles E. Eperon,Giulia Grancini,Christopher Menelaou,Marcelo J. P. Alcocer,Tomas Leijtens,Laura M. Herz,Annamaria Petrozza,Henry J. Snaith
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2013-10-18
卷期号:342 (6156): 341-344
被引量:8675
标识
DOI:10.1126/science.1243982
摘要
Unrestricted Travel in Solar Cells In the past 2 years, organolead halide perovskites have emerged as a promising class of light-harvesting media in experimental solar cells, but the physical basis for their efficiency has been unclear (see the Perspective by Hodes ). Two studies now show, using a variety of time-resolved absorption and emission spectroscopic techniques, that these materials manifest relatively long diffusion paths for charge carriers energized by light absorption. Xing et al. (p. 344 ) independently assessed (negative) electron and (positive) hole diffusion lengths and found them well-matched to one another to the ~100-nanometer optical absorption depth. Stranks et al. (p. 341 ) uncovered a 10-fold greater diffusion length in a chloride-doped material, which correlates with the material's particularly efficient overall performance. Both studies highlight effective carrier diffusion as a fruitful parameter for further optimization.
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