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Water-Soluble Polymeric Interfacial Material for Planar Perovskite Solar Cells
Lingling Zheng1,2, Yingzhuang Ma3, Lixin Xiao3,4
1School of Energy Research, Xiang'an Campus, Xiamen University , Xiamen 361100, Fujian China.
ACS Applied Materials & Interfaces
|April 4, 2017
Summary
A novel water-soluble polythiophene, PTEBS, enhances perovskite solar cells (PSCs) by improving energy levels and film quality. This leads to higher efficiency and reduced hysteresis, paving the way for low-cost, flexible PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Interfacial materials significantly impact perovskite solar cell (PSC) performance and hysteresis.
- Developing efficient and stable interfacial layers is crucial for advancing PSC technology.
Purpose of the Study:
- To investigate the use of a water-soluble polythiophene, PTEBS, as a cathode interfacial material in PSCs.
- To evaluate the effect of PTEBS on energy level alignment, film morphology, and device performance.
Main Methods:
- Fabrication of PSCs using PTEBS as a cathode interfacial layer via a low-temperature solution process.
- Characterization of device performance, including power conversion efficiency (PCE) and hysteresis.
- Analysis of energy level alignment and film morphology.
Main Results:
- PTEBS facilitated efficient energy level aligning and improved perovskite film morphology.
- Enhanced charge transport and extraction were observed due to better ohmic contact.
- Reduced charge accumulation at the interface led to less polarization and a quicker device response.
- PSCs with PTEBS achieved a power conversion efficiency of 15.4% with no apparent hysteresis.
Conclusions:
- Water-soluble polythiophene PTEBS is a practical and effective cathode interfacial material for PSCs.
- PTEBS enables the fabrication of highly efficient, low-cost PSCs compatible with low-temperature processing, roll-to-roll manufacturing, and flexible applications.