Enhanced Near-Infrared Photoresponse of Inverted Perovskite Solar Cells Through Rational Design of Bulk-Heterojunction Electron-Transporting Layers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

3 Scopus Citations
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Author(s)

  • Chih-I Chen
  • Yen-An Lu
  • Chia-Chen Lee
  • Kuo-Chuan Ho
  • Wen-Chang Chen
  • Chu-Chen Chueh

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number1901714
Journal / PublicationAdvanced Science
Volume6
Issue number21
Online published1 Sep 2019
Publication statusPublished - 6 Nov 2019

Link(s)

Abstract

How to extend the photoresponse of perovskite solar cells (PVSCs) to the region of near-infrared (NIR)/infrared light has become an appealing research subject in this field since it can better harness the solar irradiation. Herein, the typical fullerene electron-transporting layer (ETL) of an inverted PVSC is systematically engineered to enhance device's NIR photoresponse. A low bandgap nonfullerene acceptor (NFA) is incorporated into the fullerene ETL aiming to intercept the NIR light passing through the device. However, despite forming type II charge transfer with fullerene, the blended NFA cannot enhance the device's NIR photoresponse, as limited by the poor dissociation of photoexciton induced by NIR light. Fortunately, it can be addressed by adding a p-type polymer. The ternary bulk-heterojunction (BHJ) ETL is demonstrated to effectively enhance the device's NIR photoresponse due to the better cascade-energy-level alignment and increased hole mobility. By further optimizing the morphology of such a BHJ ETL, the derived PVSC is finally demonstrated to possess a 40% external quantum efficiency at 800 nm with photoresponse extended to the NIR region (to 950 nm), contributing ≈9% of the overall photocurrent. This study unveils an effective and simple approach for enhancing the NIR photoresponse of inverted PVSCs.

Research Area(s)

  • bulk-heterojunctions, electron-transporting layers, inverted perovskite solar cells, NIR photoresponse, nonfullerene acceptors

Citation Format(s)

Enhanced Near-Infrared Photoresponse of Inverted Perovskite Solar Cells Through Rational Design of Bulk-Heterojunction Electron-Transporting Layers. / Chen, Chih-I; Wu, Shengfan; Lu, Yen-An; Lee, Chia-Chen; Ho, Kuo-Chuan; Zhu, Zonglong; Chen, Wen-Chang; Chueh, Chu-Chen.

In: Advanced Science, Vol. 6, No. 21, 1901714, 06.11.2019.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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