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P-N junction

P-N junction

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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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer

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Hybrid Hole Extraction Layer Enabled High Efficiency in Polymer Solar Cells.

Zhongqiang Wang¹, Jiale Dong¹, Jian Guo¹

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

ACS Applied Materials & Interfaces

|November 30, 2020

Summary

A novel hole extraction layer (HEL) using doped copper thiocyanate (CuSCN) and TFB significantly boosts solar cell performance. This enhancement in photovoltaic devices results from improved charge extraction and reduced recombination.

Keywords:

CuSCN TFB high efficiency hole extraction layer polymer solar cells

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Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Printing Fabrication of Bulk Heterojunction Solar Cells and In Situ Morphology Characterization

Published on: January 29, 2017

Area of Science:

Materials Science
Photovoltaics
Organic Electronics

Background:

Effective charge extraction layers are crucial for high-performance solar cells.
Existing hole extraction layers (HELs) often face limitations in efficiency and compatibility.

Purpose of the Study:

To develop an improved hole extraction layer (HEL) for photovoltaic applications.
To investigate the impact of doping conductive polymer TFB into CuSCN (CuSCN:TFB(X)) on solar cell performance.

Main Methods:

Fabrication of CuSCN:TFB(X) composite as a hole extraction layer.
Integration of the CuSCN:TFB(X) HEL into organic solar cells based on PM6:Y6 blend films.
Characterization of photovoltaic performance, including power conversion efficiency (PCE).

Main Results:

The CuSCN:TFB(X) HEL demonstrated excellent light transparency and affinity for the light absorber.
CuSCN:TFB(X) HEL-based cells exhibited enhanced exciton dissociation and charge extraction.
A highest power conversion efficiency (PCE) of 15.28% was achieved, representing a >16% relative increase compared to the reference cell.

Conclusions:

Doping CuSCN with TFB effectively creates a superior hole extraction layer for organic solar cells.
The enhanced performance is attributed to improved interface energetics, charge transport, and reduced recombination.
This work presents a promising strategy for advancing photovoltaic device efficiency.