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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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Published on: November 5, 2014

Nanoscale Back Contact Perovskite Solar Cell Design for Improved Tandem Efficiency.

Gede W P Adhyaksa¹, Eric Johlin¹, Erik C Garnett¹

¹Center for Nanophotonics, AMOLF , Science Park 104, 1098 XG Amsterdam, The Netherlands.

|August 8, 2017

Summary

A new three-terminal (3-T) tandem solar cell design with nanoscale back-contacts overcomes limitations of traditional two-terminal (2-T) and four-terminal (4-T) configurations. This innovation boosts solar energy conversion efficiency, even with less-than-ideal perovskite materials.

Keywords:

Nanoscale back contacts coupled optical−electrical modeling nanowire transparent electrode perovskite carrier diffusion length perovskite-silicon tandem three-terminal

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Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Tandem photovoltaics offer a route to surpass single-junction solar cell efficiency by reducing thermalization losses.
Traditional two-terminal (2-T) and four-terminal (4-T) tandem designs face challenges with current matching (2-T) and parasitic absorption (4-T).

Purpose of the Study:

To introduce and optimize a novel three-terminal (3-T) tandem solar cell architecture utilizing a nanoscale back-contact for the top cell.
To demonstrate the potential of this 3-T design to enhance efficiency and reduce material quality requirements for perovskite-silicon tandems.

Main Methods:

Coupled optical-electrical modeling was employed to optimize the nanoscale back-contact 3-T architecture.
Simulations were performed for planar perovskite-silicon tandems with varying silicon base cell efficiencies (18% and 25%).

Main Results:

The 3-T back-contact design achieved 32.9% efficiency with an 18% silicon base cell and a 10 μm diffusion length perovskite, outperforming 4-T (30.2%) and 2-T (24.8%) configurations.
For a 25% efficient silicon base cell, the 3-T tandem reached 35.2% efficiency, compared to 32.8% for the 4-T configuration.
The design allows for independent optimization of the front surface of subcells, enabling further enhancements.

Conclusions:

The proposed 3-T tandem architecture with nanoscale back-contacts offers a significant efficiency advantage over conventional designs.
This approach relaxes the stringent material quality requirements for the top cell absorber, making high-efficiency tandems more accessible.
The back-contact strategy facilitates future improvements through advanced front-surface engineering.