Boosting the Performance of Environmentally Friendly Quantum Dot-Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

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Author(s)

  • Zhenxiao Pan
  • Liang Yue
  • Huashang Rao
  • Jie Zhang
  • Xinhua Zhong

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1903696
Journal / PublicationAdvanced Materials
Volume31
Issue number49
Online published17 Oct 2019
Publication statusPublished - 6 Dec 2019

Abstract

Generally, high light-harvesting efficiency, electron-injection efficiency, and charge-collection efficiency are the prerequisites for high-efficiency quantum-dot-sensitized solar cells (QDSCs). However, it is fairly difficult for a single QD sensitizer to meet these three requirements simultaneously. It is demonstrated that these parameters can be felicitously balanced by a cosensitization strategy through the adoption of environmental-friendly Zn-Cu-In-Se and Zn-Cu-In-S dual QD sensitizers with cascade energy structure. Experimental results indicate that: i) the combination of the dual QDs can improve the light-harvesting capability of the cells, especially in the visible light window; ii) the cosensitization approach can facilitate electron injection, benefitting from the cascade energy structure of the two QD sensitizers employed; iii) the charge-collection efficiency can be remarkably enhanced by the suppressed charge-recombination process due to the improved QD coverage on TiO2. Consequently, this cosensitization strategy delivers a new certified efficiency record of 12.98% for liquid-junction QDSCs under AM 1.5G 1 sun irradiation. Moreover, the constructed cells exhibit good stability in a high-humidity environment.

Research Area(s)

  • cosensitization, environmentally friendly solar cells, quantum dot-sensitized solar cells, CONVERSION EFFICIENCY, CUINS2

Citation Format(s)

Boosting the Performance of Environmentally Friendly Quantum Dot-Sensitized Solar Cells over 13% Efficiency by Dual Sensitizers with Cascade Energy Structure. / Pan, Zhenxiao; Yue, Liang; Rao, Huashang; Zhang, Jie; Zhong, Xinhua; Zhu, Zonglong; Jen, Alex K.-Y.

In: Advanced Materials, Vol. 31, No. 49, 1903696, 06.12.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review