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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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Updated: Jan 6, 2026

Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping

Polycrystalline Silicon Thin-film Solar cells with Plasmonic-enhanced Light-trapping

Published on: July 2, 2012

Random Micro-Pyramids for Transparent c-Si Solar Cells: Enabling 16.1% Efficiency with Wavelength-Independent 20%

Myounghyun Lee¹, Yeeun Kim¹, Yire Han²

¹School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea.

Small (Weinheim an Der Bergstrasse, Germany)

|November 22, 2025

Summary

This summary is machine-generated.

Researchers developed micro-pyramid structures for transparent photovoltaics (TPVs) to boost light absorption. This simple wet-chemical method achieved record efficiency for neutral-colored TPVs, enhancing solar technology potential.

Keywords:

crystalline‐silicon solar cells light trapping micro‐structured solar cells surface texturing transparent solar cells

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Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Transparent photovoltaics (TPVs) are promising for building-integrated applications.
Crystalline silicon (c-Si) TPVs offer transparency, efficiency, and stability.
Light loss in transparent regions limits TPV performance.

Purpose of the Study:

To enhance light absorption in c-Si TPVs.
To improve the efficiency of transparent solar technologies.
To develop a scalable and cost-effective TPV fabrication method.

Main Methods:

Forming random micro-pyramid structures on c-Si surfaces.
Utilizing a simple wet-chemical process for surface texturing.
Characterizing optical and electrical performance of TPV devices.

Main Results:

Surface micro-pyramids significantly increased light absorption without reducing visual transparency.
Achieved a record short-circuit current density (J_SC) of 32.7 mA cm^-2 for a 1 cm² device.
Demonstrated a 16.1% efficiency for a 25 cm² device with 20% average visible transmittance (AVT).

Conclusions:

The micro-pyramid approach is a scalable and cost-effective method for improving TPV performance.
This technique advances the potential for high-efficiency, neutral-colored transparent solar technologies.
Results pave the way for broader commercial applications of TPVs.