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P-N junction

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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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Related Experiment Video

Updated: Apr 25, 2026

Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells

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Published on: March 19, 2017

A Targeting Light-Management Strategy Affords Ultraviolet-Stable and Efficient Perovskite Solar Cells.

Zimin Zhang¹, Xijie Qiu¹, Wei Gong^1,2

¹Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage Devices, Collaborative Innovation Center of Advanced Energy Materials, School of Materials and Energy, Guangdong University of Technology, Guangzhou, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)

|April 24, 2026

Summary

This summary is machine-generated.

This study introduces Rhodamine B-acylhydrazine (RhBH) to improve perovskite solar cell (PSC) stability and efficiency. RhBH converts UV light to visible light, enhancing UV resistance and device performance.

Keywords:

additive engineering defect passivation down‐conversion effect perovskite solar cells ultraviolet stability

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Last Updated: Apr 25, 2026

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Flash Infrared Annealing for Perovskite Solar Cell Processing

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Published on: February 3, 2021

Area of Science:

Materials Science
Photovoltaics
Chemistry

Background:

Perovskite solar cells (PSCs) show high efficiency but suffer from poor operational stability.
Environmental stressors like UV radiation and humidity degrade PSC performance, hindering commercialization.

Purpose of the Study:

To develop a light-management strategy using Rhodamine B-acylhydrazine (RhBH) to enhance UV resistance and photon management in PSCs.
To improve the long-term operational stability and efficiency of inverted PSCs.

Main Methods:

Incorporation of a down-conversion molecule, Rhodamine B-acylhydrazine (RhBH), into PSCs.
Investigation of RhBH's interaction with perovskite components and its effect on UV light conversion.
Characterization of device efficiency and stability under UV radiation and high humidity.

Main Results:

RhBH forms chelates with Pb2+ ions, converting harmful UV light into visible light for enhanced absorption.
RhBH reduces intrinsic defects, improves perovskite crystallization, and suppresses non-radiative recombination.
Achieved a champion power conversion efficiency (PCE) of 25.91% with over 80% PCE retention after 780 hours (UV) and 1100 hours (humidity).

Conclusions:

RhBH effectively enhances UV stability and photon utilization in PSCs.
The strategy significantly improves long-term operational stability against environmental stressors.
This approach offers a promising pathway for developing stable and efficient PSCs.