Highly Electrocatalytic Cu2ZnSn(S1-xSex)4 Counter Electrodes for Quantum-Dot-Sensitized Solar Cells

被引：86

作者：

Cao, Yuebin ^{[1
]}

Xiao, Yanjun ^{[1
]}

Jung, Jin-Young ^{[1
]}

Um, Han-Don ^{[1
]}

Jee, Sang-Won ^{[1
]}

Choi, Hye Mi ^{[2
]}

Bang, Jin Ho ^{[2
]}

Lee, Jung-Ho ^{[1
]}

机构：

[1] Hanyang Univ, Dept Chem Engn, Ansan 426791, Kyeonggi Do, South Korea

[2] Hanyang Univ, Dept Chem & Appl Chem, Ansan 426791, Kyeonggi Do, South Korea

来源：

ACS APPLIED MATERIALS & INTERFACES | 2013年 / 5卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

quantum-dot-sensitized solar cells; copper zinc tin sulfur (selenium); counter electrodes; electrocatalytic activity; NANOCRYSTALS; CARBON; PBS;

D O I：

10.1021/am302522c

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Traditional Pt counter electrode in quantum-dot-sensitized solar cells suffers from a low electrocatalytic activity and instability due to irreversible surface adsorption of sulfur species incurred while regenerating polysulfide (S-n(2-)/S2-) electrolytes. To overcome such constraints, chemically synthesized Cu2ZnSn(S1-xSex)(4) nanocrystals were evaluated as an alternative to Pt. The resulting chalcogenides exhibited remarkable electrocatalytic activities for reduction of polysulfide (S-n(2-)) to sulfide (S2-), which were dictated by the ratios of S/Se. In this study, a quantum dot sensitized solar cell constructed with Cu2ZnSn(S0.5Se0.5)(4) as a counter electrode showed the highest energy conversion efficiency of 3.01%, which was even higher than that using Pt (1.24%). The compositional variations in between Cu2ZnSnS4 (x = 0) and Cu2ZnSnSe4 (x = 1) revealed that the solar cell performances were closely related to a difference in electrocatalytic activities for polysulfide reduction governed by the S/Se ratios.

引用

页码：479 / 484

页数：6

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