Atomically Altered Hematite for Highly Efficient Perovskite Tandem Water-Splitting Devices

被引：56

作者：

Gurudayal ^{[1
]}

John, Rohit Abraham ^{[1
]}

Boix, Pablo P. ^{[2
]}

Yi, Chenyi ^{[3
]}

Shi, Chen ^{[2
]}

Scott, M. C. ^{[4
,5
]}

Veldhuis, Sjoerd A. ^{[2
]}

Minor, Andrew M. ^{[4
,5
]}

Zakeeruddin, Shaik M. ^{[3
]}

Wong, Lydia Helena ^{[1
]}

Gratzel, Michael ^{[3
]}

Mathews, Nripan ^{[1
,2
]}

机构：

[1] Nanyang Technol Univ, Sch Mat Sci & Engn, Nanyang Ave, Singapore 639798, Singapore

[2] Energy Res Inst NTU, ERI N, Res Techno Plaza,X Frontier Block,Level 5, Singapore 637553, Singapore

[3] Swiss Fed Inst Technol, Dept Chem & Chem Engn, Lab Photon & Interfaces, Stn 6, CH-1015 Lausanne, Switzerland

[4] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[5] Lawrence Berkeley Natl Lab, Mol Foundry, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

来源：

CHEMSUSCHEM | 2017年 / 10卷 / 11期

基金：

新加坡国家研究基金会;

关键词：

atomic layer deposition; hematite; perovskite solar cell; tandem cell; water splitting; PERFORMANCE; PHOTOANODES; PHOTOELECTRODES; NANOSTRUCTURES; FILMS; SEMICONDUCTOR; ENHANCEMENT; ELECTRODES; STABILITY;

D O I：

10.1002/cssc.201700159

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Photoelectrochemical (PEC) cells are attractive for storing solar energy in chemical bonds through cleaving of water into oxygen and hydrogen. Although hematite (alpha-Fe2O3) is a promising photoanode material owing to its chemical stability, suitable band gap, low cost, and environmental friendliness, its performance is limited by short carrier lifetimes, poor conductivity, and sluggish kinetics leading to low (solar-to-hydrogen) STH efficiency. Herein, we combine solution-based hydrothermal growth and a post-growth surface exposure through atomic layer deposition (ALD) to show a dramatic enhancement of the efficiency for water photolysis. These modified photoanodes show a high photocurrent of 3.12 mAcm(-2) at 1.23V versus RHE, (> 5 times higher than Fe2O3) and a plateau photocurrent of 4.5 mAcm(-2) at 1.5 V versus RHE. We demonstrate that these photoanodes in tandem with a CH3NH3PbI3 perovskite solar cell achieves overall unassisted water splitting with an STH conversion efficiency of 3.4%, constituting a new benchmark for hematite-based tandem systems.

引用

页码：2449 / 2456

页数：8

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