Related Experiment Video
Updated: Aug 6, 2026
Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Enhancing Phonon Group Velocities and Interfacial Heat Conduction for Efficient and Stable Perovskite Solar Cells
Xing Wu1, Yu Chen2, Yang Shen3
1College of Materials and Chemistry & Chemical Engineering, Applied Nuclear Technology in Geosciences Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu, PR China.
Researchers developed a novel composite hole-transport layer (HTL) using CuBi2O4 to improve heat conduction in perovskite solar cells (PSCs). This innovation enhances thermal compatibility, reduces heat accumulation, and boosts power conversion efficiency and device stability.
Area of Science:
- Materials Science
- Renewable Energy
- Semiconductor Physics
Background:
- Conventional hole-transport layers (HTLs) in perovskite solar cells (PSCs) exhibit low thermal conductivity, causing heat accumulation and performance loss.
- This heat issue leads to nonradiative recombination and limits the efficiency and stability of PSCs.
Purpose of the Study:
- To develop a novel composite HTL with enhanced thermal conductivity for inverted PSCs.
- To improve heat transfer dynamics and thermal compatibility between the HTL and perovskite absorber.
- To enhance the power conversion efficiency (PCE) and long-term stability of PSCs.
Main Methods:
- Development of a spinel-type semiconductor, CuBi2O4, for integration into a composite HTL.
- Engineering the composite HTL to enhance phonon group velocities and thermal conductivity.
- Characterization of thermal-expansion coefficient alignment and hot-carrier relaxation dynamics.
- Fabrication and testing of inverted PSCs incorporating the CuBi2O4-based composite HTL.
Main Results:
- The CuBi2O4-based composite HTL demonstrated superior thermal compatibility and enhanced heat conduction.
- Hot-carrier relaxation was significantly delayed, and excess energy dissipation was reduced by approximately 10-fold.
- High-quality perovskite films with ordered orientation and reduced residual strain were achieved.
- A certified PCE of 26.83% was obtained, with a device PCE of 27.18%.
- The engineered PSCs maintained over 80% of their initial PCE after 2000 hours under various stress conditions (ISOS-D-2Ⅰ, ISOS-D-3, ISOS-T-1, ISOS-L-1).
Conclusions:
- The CuBi2O4-based composite HTL effectively addresses the thermal management challenges in PSCs.
- Phonon engineering of HTLs is a promising strategy for improving PSC efficiency and operational stability.
- This work paves the way for more robust and efficient perovskite solar cell technologies.
