Energy Level Modification with Carbon Dot Interlayers Enables Efficient Perovskite Solar Cells and Quantum Dot Based Light-Emitting Diodes

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

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Author(s)

  • Xiaoyu Zhang
  • Qingsen Zeng
  • Tianjiao Ji
  • Chen Wang
  • Xinyu Shen
  • Min Lu
  • Haoran Wang
  • Shanpeng Wen
  • Yu Zhang
  • Xuyong Yang
  • Xin Ge
  • Wei Zhang
  • Aleksandr P. Litvin
  • Alexander V. Baranov
  • Dong Yao
  • Hao Zhang
  • Bai Yang
  • Weitao Zheng

Detail(s)

Original languageEnglish
Article number1910530
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number11
Online published22 Jan 2020
Publication statusPublished - 10 Mar 2020

Abstract

Controlling the transport and minimizing charge carrier trapping at interfaces is crucial for the performance of various optoelectronic devices. Here, how electronic properties of stable, abundant, and easy-to-synthesized carbon dots (CDs) are controlled via the surface chemistry through a chosen ratio of their precursors citric acid and ethylenediamine are demonstrated. This allows to adjust the work function of indium tin oxide (ITO) films over the broad range of 1.57 eV, through deposition of thin CD layers. CD modifiers with abundant amine groups reduce the ITO work function from 4.64 to 3.42 eV, while those with abundant carboxyl groups increase it to 4.99 eV. Using CDs to modify interfaces between metal oxide (SnO2 and ZnO) films and active layers of solar cells and light-emitting diodes (LEDs) allows to significantly improve their performance. Power conversion efficiency of CH3NH3PbI3 perovskite solar cells increases from 17.3% to 19.5%; the external quantum efficiency of CsPbI3 perovskite quantum dot LEDs increases from 4.8% to 10.3%; and that of CdSe/ZnS quantum dot LEDs increases from 8.1% to 21.9%. As CD films are easily fabricated in air by solution processing, the approach paves the way to a simplified manufacturing of large-area and low-cost optoelectronic devices.

Research Area(s)

  • carbon dots, interface engineering, ITO work function, light-emitting diodes, solar cells

Citation Format(s)

Energy Level Modification with Carbon Dot Interlayers Enables Efficient Perovskite Solar Cells and Quantum Dot Based Light-Emitting Diodes. / Zhang, Xiaoyu; Zeng, Qingsen; Xiong, Yuan; Ji, Tianjiao; Wang, Chen; Shen, Xinyu; Lu, Min; Wang, Haoran; Wen, Shanpeng; Zhang, Yu; Yang, Xuyong; Ge, Xin; Zhang, Wei; Litvin, Aleksandr P.; Baranov, Alexander V.; Yao, Dong; Zhang, Hao; Yang, Bai; Rogach, Andrey L.; Zheng, Weitao.

In: Advanced Functional Materials, Vol. 30, No. 11, 1910530, 10.03.2020.

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