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Interfacial Layer Materials with a Truxene Core for Dopant-Free NiOx-Based Inverted Perovskite Solar Cells
Rajarathinam Ramanujam1,2,3, Hsiang-Lin Hsu4, Zhong-En Shi4
1Institute of Chemistry, Academia Sinica, Nankang, Taipei, 11529, Taiwan, ROC.
Small (Weinheim an Der Bergstrasse, Germany)
|March 7, 2024
Summary
New hole-transporting materials (HTMs) based on a truxene core significantly enhance perovskite solar cell performance. These TRUX-D materials improve crystallinity and charge extraction, leading to higher power conversion efficiency and remarkable long-term stability.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Nickel oxide (NiOx) is a common hole-transporting material (HTM) in perovskite solar cells.
- Weak interaction between NiOx and perovskite (CH3NH3PbI3 or MAPbI3) limits device performance and stability.
- Issues include poor crystallinity, inefficient hole extraction, and increased carrier recombination.
Purpose of the Study:
- To design and synthesize novel HTMs with a rigid truxene core for improved perovskite solar cell interfaces.
- To investigate the effectiveness of these new materials as interfacial layers (IFLs) between NiOx and MAPbI3.
- To enhance perovskite crystallinity, charge extraction, and device stability.
Main Methods:
- Synthesis of two truxene-based HTMs, TRUX-D1 and TRUX-D2, featuring a C3 symmetric core and electron-donating amino groups.
- Incorporation of TRUX-D molecules as interfacial layers (IFLs) between NiOx and MAPbI3.
- Characterization of device performance, including power conversion efficiency (PCE) and long-term stability under various conditions.
Main Results:
- TRUX-D IFLs improved perovskite crystallinity and minimized nonradiative recombination.
- Accelerated charge extraction was confirmed through various characterization techniques.
- TRUX-D1 achieved a maximum PCE of 20.8%.
- Unencapsulated devices retained 98% performance after 210 days in a glove box.
- Devices maintained 75.5% performance after 80 days in ambient air with >40% humidity.
Conclusions:
- Truxene-based interfacial layers effectively address the limitations of NiOx in perovskite solar cells.
- The designed HTMs enhance charge transfer and improve device operational stability.
- These findings offer a promising strategy for developing highly efficient and stable perovskite solar cells.
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