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Enhanced Interface Compatibility by Ionic Dendritic Molecules To Achieve Efficient and Stable Perovskite Solar Cells
Lianlian Qi1, Guozheng Du1, Guojie Zhu1
1College of Materials, Fujian Key Laboratory of Advanced Materials, Xiamen Key Laboratory of Electronic Ceramic Materials and Devices, Xiamen University, Xiamen 361005, China.
ACS Applied Materials & Interfaces
|August 17, 2023
Summary
Ionic dendritic molecules improve perovskite solar cell (PSC) performance by enhancing interfacial compatibility and charge transport in poly(3-hexylthiophene) (P3HT) layers. This leads to higher efficiency and stability in PSCs.
Area of Science:
- Materials Science
- Renewable Energy
- Organic Electronics
Background:
- Poly(3-hexylthiophene) (P3HT) is a key hole transport material in perovskite solar cells (PSCs).
- Interfacial energy losses between P3HT and perovskite limit PSC efficiency and stability.
- Developing effective interface engineering strategies is crucial for advancing PSC technology.
Purpose of the Study:
- To design and synthesize novel ionic dendritic molecules as interlayers for PSCs.
- To enhance interfacial compatibility between P3HT and perovskite layers.
- To improve charge extraction, transport, and overall device performance and stability.
Main Methods:
- Rational design and synthesis of two ionic dendritic molecules: MPA-Cz-FAI and MPA-PA-FAI.
- Incorporation of these molecules as interlayers in P3HT-based PSCs.
- Characterization of device performance, including power conversion efficiency (PCE) and stability under ambient conditions.
Main Results:
- The designed interlayers improved microstructure, conductivity, and energy level alignment at the P3HT/perovskite interface.
- Defect passivation and enhanced interfacial hole extraction were achieved, suppressing nonradiative recombination.
- P3HT-based PSCs modified with MPA-Cz-PAI achieved a champion efficiency of 19.7% (vs. 15.4% for control).
- Unencapsulated devices retained over 85% efficiency after 1500 hours under 70% relative humidity.
Conclusions:
- Ionic dendritic molecules are effective for interface engineering in PSCs.
- The developed interlayers significantly boost PSC efficiency and environmental stability.
- This molecular design strategy offers a promising pathway for future high-performance and stable perovskite solar cells.
