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Related Concept Videos

P-N junction01:11

P-N junction

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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Related Experiment Video

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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells
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Two-Dimensional BAs/InTe: A Promising Tandem Solar Cell with High Power Conversion Efficiency.

Meiqiu Xie1,2, Bo Cai2, Zhaoshun Meng1

  • 1New Energy Technology Engineering Laboratory of Jiangsu Province and School of Science , Nanjing University of Posts and Telecommunications (NJUPT) , Nanjing 210023 , China.

ACS Applied Materials & Interfaces
|January 21, 2020
PubMed
Summary

This study introduces a novel two-dimensional (2D) BAs/InTe tandem solar cell (SC) that surpasses 30% solar-to-electric conversion efficiency. The design overcomes band gap mismatches for improved photovoltaic performance.

Keywords:
BAs/InTedensity functional theorypower conversion efficiencytandem solar cellstwo-dimensional

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Area of Science:

  • Materials Science
  • Renewable Energy
  • Nanotechnology

Background:

  • Tandem solar cells (SCs) offer potential for high efficiency by combining subcells with different absorption bands.
  • Band gap mismatch between subcells remains a key challenge hindering performance improvement in tandem SC architectures.

Purpose of the Study:

  • To design and investigate a novel two-dimensional (2D) BAs/InTe-based tandem solar cell (SC).
  • To achieve a solar-to-electric conversion efficiency exceeding 30% by addressing band gap mismatch issues.

Main Methods:

  • Density functional theory (DFT) calculations were used to assess the thermodynamic stability of hexagonal single-layer BX and single-layer YZ materials.
  • HSE06 functional was employed to determine band gaps for constructing 2D tandem SCs.
  • The BAs/InTe material combination was specifically chosen for its favorable band gap alignment.

Main Results:

  • High thermodynamic stability was predicted for single-layer BX (X=P, As) and YZ (Y=Ga, In; Z=S, Se, Te) materials.
  • The BAs/InTe-based tandem SC demonstrated a predicted power conversion efficiency of 30.2%.
  • Experimental preparation of constituent materials like few-layer GaZ and InSe supports the feasibility of the proposed 2D tandem SCs.

Conclusions:

  • The designed 2D BAs/InTe tandem SC effectively captures a broad solar spectrum, achieving high efficiency.
  • The study highlights the potential of 2D materials for developing competitive, high-performance tandem solar cells.
  • The findings suggest a promising pathway towards commercialized, efficient photovoltaic technologies.