Chloride Passivation of ZnO Electrodes Improves Charge Extraction in Colloidal Quantum Dot Photovoltaics

被引：137

作者：

Choi, Jongmin ^{[1
]}

Kim, Younghoon ^{[1
]}

Jo, Jea Woong ^{[1
]}

Kim, Junghwan ^{[1
]}

Sun, Bin ^{[1
]}

Walters, Grant ^{[1
]}

de Arquer, F. Pelayo Garcia ^{[1
]}

Quintero-Bermudez, Rafael ^{[1
]}

Li, Yiying ^{[2
]}

Tan, Chih Shan ^{[1
]}

Quan, Li Na ^{[1
]}

Kam, Andrew Pak Tao ^{[1
]}

Hoogland, Sjoerd ^{[1
]}

Lu, Zhenghong ^{[2
]}

Voznyy, Oleksandr ^{[1
]}

Sargent, Edward H. ^{[1
]}

机构：

[1] Univ Toronto, Dept Elect & Comp Engn, 10 Kings Coll Rd, Toronto, ON M5S 3G4, Canada

[2] Univ Toronto, Dept Mat Sci & Engn, 184 Coll St, Toronto, ON M5S 3E4, Canada

来源：

ADVANCED MATERIALS | 2017年 / 29卷 / 33期

基金：

加拿大自然科学与工程研究理事会; 新加坡国家研究基金会;

关键词：

band alignment; passivation; quantum-dot solar cells; ZnO; POLYMER SOLAR-CELLS; THIN-FILMS; EFFICIENT; PERFORMANCE; SOLIDS; LAYER; NANOPARTICLES; CONDUCTIVITY; NANOWIRES; OXIDE;

D O I：

10.1002/adma.201702350

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The tunable bandgap of colloidal quantum dots (CQDs) makes them an attractive material for photovoltaics (PV). The best present-day CQD PV devices employ zinc oxide (ZnO) as an electron transport layer; however, it is found herein that ZnO's surface defect sites and unfavorable electrical band alignment prevent devices from realizing their full potential. Here, chloride (Cl)-passivated ZnO generated from a solution of presynthesized ZnO nanoparticles treated using an organic-solvent-soluble Cl salt is reported. These new ZnO electrodes exhibit decreased surface trap densities and a favorable electronic band alignment, improving charge extraction from the CQD layer and achieving the best-cell power conversion efficiency (PCE) of 11.6% and an average PCE of 11.4 +/- 0.2%.

引用

页数：5

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