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Related Concept Videos

P-N junction01:11

P-N junction

758
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...
758

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Above 15% Efficient Directly Sputtered CIGS Solar Cells Enabled by a Modified Back-Contact Interface.

Wanlei Dai1, Zeran Gao1, Jianjun Li2

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Summary
This summary is machine-generated.

Researchers developed a novel method to fabricate high-efficiency copper indium gallium selenide (CIGS) solar cells. A thin molybdenum selenide (MoSe2) layer, formed without a selenium atmosphere, significantly improved performance by reducing the back-contact barrier.

Keywords:
CIGSback contactquaternary targetsputteringthin film

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Area of Science:

  • Materials Science
  • Photovoltaics
  • Semiconductor Physics

Background:

  • Schottky back-contact barriers at the Mo/Cu(In,Ga)Se2 (CIGS) interface limit CIGS solar cell performance.
  • A MoSe2 intermediate layer can reduce this barrier, enhancing hole transport.
  • Conventional direct sputtering methods struggle to form MoSe2 without a selenium atmosphere.

Purpose of the Study:

  • To fabricate high-efficiency CIGS solar cells using a direct sputtering process without a selenium atmosphere.
  • To investigate the formation and impact of a MoSe2 intermediate layer on photovoltaic performance.
  • To provide an industrially viable approach for commercializing directly sputtered CIGS solar cells.

Main Methods:

  • Deposition of an intermediate CIGS layer on a Mo substrate at room temperature.
  • Ramping the structure to a high temperature (600 °C) to facilitate MoSe2 formation.
  • Characterization of the MoSe2 layer and its effect on the CIGS/Mo interface and cell efficiency.

Main Results:

  • A Se-rich, amorphous CIGS intermediate layer reacted with the Mo substrate at high temperatures to form a thin MoSe2 layer.
  • The formed MoSe2 layer effectively reduced the CIGS/Mo barrier height, improving hole transport.
  • CIGS solar cells with an 80 nm intermediate layer achieved a power conversion efficiency of 15.8%.

Conclusions:

  • Direct sputtering of CIGS solar cells without a selenium atmosphere is feasible by utilizing a Se-rich intermediate CIGS layer.
  • The in-situ formed MoSe2 layer is crucial for reducing the back-contact barrier and enhancing device performance.
  • This method offers a new pathway for the commercialization of directly sputtered CIGS solar cells.