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22% Efficiency Inverted Perovskite Photovoltaic Cell Using Cation-Doped Brookite TiO2 Top Buffer
Xiaowen Hu1,2, Chang Liu3, Zhiyong Zhang3
1Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays South China Academy of Advanced Optoelectronics South China Normal University Guangzhou 510006 China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 25, 2020
Summary
Developing durable and efficient perovskite solar cells is key for commercialization. A novel fullerene-embedded TiO2 nanorod buffer layer significantly boosts performance and longevity in inverted perovskite solar cells.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Commercializing perovskite solar cells requires high efficiency and durability.
- Inverted perovskite photovoltaic (IP-PV) cells offer a promising path, but material limitations for back-electrode buffers hinder progress.
- A need exists for advanced buffer materials to improve IP-PV performance and stability.
Purpose of the Study:
- To develop a novel top modification buffer for IP-PV cells.
- To enhance electron extraction, energy level matching, and durability in IP-PV devices.
- To address the limited material inventory for IP-PV back-electrode buffers.
Main Methods:
- Fabrication of a composite buffer using 1D cation-doped TiO2 brookite nanorods (NRs) embedded with 0D fullerene.
- Incorporation of transition metal cations (Co or Fe) into TiO2 NRs to tune electronic properties.
- Characterization of the composite buffer's impact on film uniformity, electron transport, energy level alignment, and moisture resistance in IP-PV cells.
Main Results:
- The composite buffer improved film uniformity, electron extraction and transfer, energy level matching, and moisture resistance.
- The developed IP-PV cells achieved over 22% power conversion efficiency.
- The working lifetime of the IP-PV cells was extended 22-fold compared to controls.
Conclusions:
- A novel 0D:1D composite buffer material (fullerene-embedded cation-doped TiO2 NRs) enhances IP-PV performance and durability.
- This strategy expands the material options for top electron buffers in perovskite solar cells.
- The findings present a new approach for optimizing perovskite photovoltaic devices.
