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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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Ambient Method for the Production of an Ionically Gated Carbon Nanotube Common Cathode in Tandem Organic Solar Cells

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Tandem Solar Cells from Accessible Low Band-Gap Polymers Using an Efficient Interconnecting Layer.

Santanu Bag^1,2, Romesh J Patel^1,2, Ajaykumar Bunha^1,2

¹Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson Air Force Base , Dayton, Ohio 45433, United States.

ACS Applied Materials & Interfaces

|December 25, 2015

Summary

This study presents a novel tandem polymer solar cell using scalable materials and a new Cr/MoO3 interconnecting layer. This advancement enhances solar energy capture and device efficiency for practical applications.

Keywords:

interconnecting layer isoindigo polymers scalable solution processing tandem solar cells

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Area of Science:

Materials Science
Renewable Energy
Organic Electronics

Background:

Tandem solar cells capture a wider solar spectrum than single-junction devices.
Developing transparent interconnecting layers for polymer tandem solar cells is crucial.
Scalable synthesis and high performance of polymers are essential for practical applications.

Purpose of the Study:

To demonstrate a novel tandem polymer solar cell architecture.
To introduce a new, transparent, and efficient interconnecting layer.
To utilize readily synthesized, high-performance polymer materials.

Main Methods:

Fabrication of a tandem polymer solar cell combining P(T3-iI)-2 and PCDTBT.
Development and characterization of a novel Cr/MoO3 interconnecting layer.
Performance evaluation under AM 1.5G solar illumination.

Main Results:

The novel Cr/MoO3 interconnecting layer exhibits >80% transparency above 375 nm.
The tandem cell achieved a 6% power conversion efficiency.
Demonstrated the effectiveness of a thin, evaporated Cr/MoO3 layer in tandem polymer solar cells.

Conclusions:

A novel tandem polymer solar cell was successfully demonstrated using scalable P(T3-iI)-2 and a Cr/MoO3 interconnecting layer.
The Cr/MoO3 layer is a viable, transparent, and efficient interconnect for tandem polymer solar cells.
This work expands the material options for fabricating efficient tandem polymer solar cells with scalable components.