Reduced recombination via tunable surface fields in perovskite thin films

被引：29

作者：

deQuilettes, Dane W. ^{[1
]}

Yoo, Jason J. ^{[2
,3
]}

Brenes, Roberto ^{[1
,4
]}

Kosasih, Felix Utama ^{[5
]}

Laitz, Madeleine ^{[1
,4
]}

Dou, Benjia Dak ^{[1
]}

Graham, Daniel J. ^{[6
]}

Ho, Kevin ^{[7
]}

Shi, Yangwei ^{[7
,8
]}

Shin, Seong Sik ^{[3
,9
,10
,11
]}

Ducati, Caterina ^{[5
]}

Bawendi, Moungi G. ^{[2
]}

Bulovic, Vladimir ^{[1
,4
]}

机构：

[1] MIT, Res Lab Elect, Cambridge, MA 02139 USA

[2] MIT, Dept Chem, Cambridge, MA 02139 USA

[3] Korea Res Inst Chem Technol, Div Adv Mat, Daejeon, South Korea

[4] MIT, Dept Elect Engn & Comp Sci, Cambridge, MA 02139 USA

[5] Univ Cambridge, Dept Mat Sci & Met, Cambridge, England

[6] Univ Washington, Dept Bioengn, Seattle, WA USA

[7] Univ Washington, Dept Chem, Seattle, WA USA

[8] Univ Washington, Mol Engn & Sci Inst, Seattle, WA USA

[9] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol SAINT, Dept Nano Engn, Suwon, South Korea

[10] Sungkyunkwan Univ, SKKU Adv Inst Nanotechnol SAINT, Dept Nano Sci & Technol, Suwon, South Korea

[11] Sungkyunkwan Univ, SKKU Inst Energy Sci & Technol SIEST, Suwon, South Korea

来源：

NATURE ENERGY | 2024年 / 9卷 / 04期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

SOLAR-CELLS; CARRIER LIFETIME; MU-S; EFFICIENT; 30-PERCENT;

D O I：

10.1038/s41560-024-01470-5

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

The ability to reduce energy loss at semiconductor surfaces through passivation or surface field engineering is an essential step in the manufacturing of efficient photovoltaic (PV) and optoelectronic devices. Similarly, surface modification of emerging halide perovskites with quasi-two-dimensional (2D) heterostructures is now ubiquitous to achieve PV power conversion efficiencies (PCEs) >25%, yet a fundamental understanding to how these treatments function is still generally lacking. Here we use a unique combination of depth-sensitive nanoscale characterization techniques to uncover a tunable passivation strategy and mechanism found in perovskite PV devices that were the first to reach the >25% PCE milestone. Namely, treatment with hexylammonium bromide leads to the simultaneous formation of an iodide-rich 2D layer along with a Br halide gradient that extends from defective surfaces and grain boundaries into the bulk three-dimensional (3D) layer. This interface can be optimized to extend the charge carrier lifetime to record values >30 mu s and to reduce interfacial recombination velocities to values as low as <7 cm s(-1).

引用

页码：457 / 466

页数：13

共 64 条

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[2]

2-D

[3]

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