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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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Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

Published on: February 27, 2017

Reducing Interfacial Losses in Solution-Processed Integrated Perovskite-Organic Solar Cells.

Nan Weng¹, Qiaogan Liao¹, Xiao Li¹

¹Engineering Research Center of Electronic Information Materials and Devices (Ministry of Education), Guangxi Key Laboratory of Information Materials, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, China.

ACS Applied Materials & Interfaces

|February 15, 2024

Summary

A novel titanium chelate interlayer (C10H14O5Ti) was introduced in perovskite solar cells (PSCs) to reduce charge recombination. This strategy enhances device performance, achieving a power conversion efficiency of 20.91%.

Keywords:

bulk heterojunction integrated perovskite-organic solar cells interfacial loss passivation effect titanium chelates

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Last Updated: Jul 3, 2025

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance

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Published on: February 27, 2017

Flash Infrared Annealing for Perovskite Solar Cell Processing

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Published on: February 3, 2021

In situ Grazing Incidence Small Angle X-ray Scattering on Roll-To-Roll Coating of Organic Solar Cells with Laboratory X-ray Instrumentation

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Published on: March 2, 2021

Area of Science:

Materials Science
Renewable Energy
Photovoltaics

Background:

Low bandgap organic semiconductors broaden light absorption in perovskite solar cells (PSCs).
Interfacial charge recombination between perovskite and organic layers limits PSC performance.
Energy loss at the heterointerface contact is a significant challenge.

Purpose of the Study:

To introduce a titanium chelate, bis(2,4-pentanedionato) titanium(IV) oxide (C10H14O5Ti), as an interlayer in PSCs.
To investigate the effect of C10H14O5Ti on the perovskite/organic semiconductor interface.
To improve the power conversion efficiency (PCE) of inverted PSCs by minimizing interfacial loss.

Main Methods:

Directly employed C10H14O5Ti as an interlayer between the perovskite and organic bulk heterojunction layers.
Analyzed the impact of C10H14O5Ti on perovskite film surface potential and passivation.
Fabricated and characterized inverted PSCs with the C10H14O5Ti interlayer.

Main Results:

C10H14O5Ti increased the surface potential and passivated the perovskite film surface.
The modified perovskite layer exhibited a smoother surface and higher work function.
Devices with C10H14O5Ti achieved a maximum PCE of 20.91% with a high open-circuit voltage of 1.15 V.

Conclusions:

C10H14O5Ti effectively reduces interfacial energy loss in perovskite solar cells.
The titanium chelate interlayer enhances the performance of inverted PSCs.
This approach offers a promising strategy for developing high-performance perovskite solar cells.