光电阴极
材料科学
光电子学
载流子
各向异性
异质结
光伏
电子迁移率
Crystal(编程语言)
微晶
载流子寿命
单晶
飞秒
光学
光伏系统
化学
激光器
结晶学
物理
电子
冶金
计算机科学
程序设计语言
量子力学
生态学
硅
生物
作者
Linfeng Pan,Linjie Dai,Oliver J. Burton,Lu Chen,Virgil Andrei,Youcheng Zhang,Dan Ren,Jinshui Cheng,Linxiao Wu,Kyle Frohna,Anna Abfalterer,Terry Chien‐Jen Yang,Wenzhe Niu,Meng Xia,Stephan Hofmann,Paul J. Dyson,Erwin Reisner,Henning Sirringhaus,Jingshan Luo,Anders Hagfeldt,Michaël Grätzel,Samuel D. Stranks
出处
期刊:Nature
[Springer Nature]
日期:2024-04-24
卷期号:628 (8009): 765-770
被引量:6
标识
DOI:10.1038/s41586-024-07273-8
摘要
Abstract Solar fuels offer a promising approach to provide sustainable fuels by harnessing sunlight 1,2 . Following a decade of advancement, Cu 2 O photocathodes are capable of delivering a performance comparable to that of photoelectrodes with established photovoltaic materials 3–5 . However, considerable bulk charge carrier recombination that is poorly understood still limits further advances in performance 6 . Here we demonstrate performance of Cu 2 O photocathodes beyond the state-of-the-art by exploiting a new conceptual understanding of carrier recombination and transport in single-crystal Cu 2 O thin films. Using ambient liquid-phase epitaxy, we present a new method to grow single-crystal Cu 2 O samples with three crystal orientations. Broadband femtosecond transient reflection spectroscopy measurements were used to quantify anisotropic optoelectronic properties, through which the carrier mobility along the [111] direction was found to be an order of magnitude higher than those along other orientations. Driven by these findings, we developed a polycrystalline Cu 2 O photocathode with an extraordinarily pure (111) orientation and (111) terminating facets using a simple and low-cost method, which delivers 7 mA cm −2 current density (more than 70% improvement compared to that of state-of-the-art electrodeposited devices) at 0.5 V versus a reversible hydrogen electrode under air mass 1.5 G illumination, and stable operation over at least 120 h.
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