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Highly efficient inverted polymer solar cells by using solution processed MgO/ZnO composite interfacial layers.

Shuai Huang1, Bonan Kang2, Lian Duan1

  • 1Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China; Center of Flexible Electronics Technology, Tsinghua University, Beijing 100084, China.

Journal of Colloid and Interface Science
|October 1, 2020
PubMed
Summary
This summary is machine-generated.

A new magnesium oxide (MgO) and ZnO stacked structure significantly boosts inverted polymer solar cell (PSC) efficiency. This cathode interfacial layer enhances electron collection and reduces recombination, achieving a 11.02% power conversion efficiency (PCE).

Keywords:
Carrier recombinationFTO electrodeHole blockingMgO nanoparticlesPolymer solar cells

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Photovoltaics

Background:

  • Polymer solar cells (PSCs) require efficient cathode interfacial layers for optimal performance.
  • Existing interfacial layers often face challenges with surface defects and carrier recombination.

Purpose of the Study:

  • To develop and demonstrate a highly efficient inverted PSC using a novel MgO/ZnO stacked structure as a cathode interfacial layer.
  • To investigate the combined benefits of ZnO as an electron transport layer (ETL) and MgO for surface defect reduction and hole blocking.

Main Methods:

  • Fabrication of inverted PSCs utilizing a PTB7-Th:PC71BM photoactive layer.
  • Implementation of a MgO/ZnO stacked film as the cathode interfacial layer.
  • Comparative efficiency analysis of PSCs with and without the MgO interlayer.

Main Results:

  • The MgO/ZnO bilayer structure effectively serves as an electron transport layer and reduces FTO surface defects while blocking holes.
  • This dual-functionality leads to enhanced electron collection and suppressed carrier recombination at the interface.
  • The inverted PSC with the MgO/ZnO cathode interfacial layer achieved a power conversion efficiency (PCE) of 11.02%, compared to 8.79% without MgO.

Conclusions:

  • The MgO/ZnO stacked structure is a highly effective cathode interfacial layer for inverted PSCs.
  • This bilayer approach significantly improves device performance by optimizing interfacial properties.
  • The MgO/ZnO structure shows promise as a superior interfacial material for organic photovoltaics and other photoelectric devices.