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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition
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Solution-Processable ZnO/Carbon Quantum Dots Electron Extraction Layer for Highly Efficient Polymer Solar Cells.

Ruqin Zhang1, Min Zhao1, Zhongqiang Wang1

  • 1Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology , Taiyuan 030024, China.

ACS Applied Materials & Interfaces
|January 18, 2018
PubMed
Summary

We developed high-efficiency inverted polymer solar cells (PSCs) using a novel bilayer electron extraction layer (EEL) of ZnO/carbon quantum dots (C-QDs). This approach significantly boosts power conversion efficiency (PCE) by reducing charge recombination and improving charge extraction.

Keywords:
C-QDsEELZnObilayerpolymer solar cells

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Polymer solar cells (PSCs) offer a promising route to low-cost, flexible photovoltaic devices.
  • Achieving high power conversion efficiency (PCE) in inverted PSCs requires efficient electron extraction and minimal charge recombination.
  • Surface defects in electron extraction layers (EELs) can lead to exciton quenching and reduced device performance.

Purpose of the Study:

  • To develop high-efficiency inverted PSCs by employing a solution-processable bilayer ZnO/carbon quantum dots (C-QDs) EEL.
  • To investigate the mechanism by which the bilayer EEL enhances device performance.
  • To demonstrate a significant improvement in PCE compared to control devices.

Main Methods:

  • Fabrication of inverted PSCs utilizing a specific polymer:fullerene derivative blend.
  • Application of a bilayer ZnO/C-QD EEL as an electron extraction layer.
  • Characterization of device performance, including power conversion efficiency (PCE).

Main Results:

  • The bilayer ZnO/C-QD EEL effectively passivates ZnO surface defects, suppressing exciton quenching.
  • This passivation leads to enhanced exciton dissociation, reduced charge recombination, and improved charge extraction.
  • Inverted PSCs with the bilayer EEL achieved a PCE of ~9.64%, a >27% improvement over the control cell (~7.59%).

Conclusions:

  • The bilayer ZnO/C-QD EEL is a highly effective strategy for improving the performance of inverted PSCs.
  • This approach offers a promising pathway for developing next-generation, high-efficiency polymer solar cells.
  • The passivation of surface defects is crucial for optimizing electron extraction and overall device efficiency.