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Stabilizing Non-Fullerene Organic Photodiodes through Interface Engineering Enabled by a Tin Ion-Chelated Polymer
Jianhua Xiao1, Yang Wang1, Liu Yuan1
1State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China.
A novel tin ion-chelated interface layer (PEIE-Sn) enhances the stability and performance of organic photodiodes (OPDs) by optimizing interfaces and reducing degradation. This breakthrough improves anti-environmental interference and photoelectric characteristics for unencapsulated devices.
Area of Science:
- Materials Science
- Organic Electronics
- Interface Engineering
Background:
- Non-fullerene acceptors (NFAs) have advanced organic photodiodes (OPDs), but interface instability hinders device longevity.
- Inverted NF-OPDs suffer from degradation due to suboptimal interfaces, limiting their practical applications.
Purpose of the Study:
- To develop a stable cathode interfacial layer (CIL) for non-fullerene acceptor organic photodiodes (NF-OPDs).
- To investigate the efficacy of tin ion-chelated polyethyleneimine ethoxylated (PEIE-Sn) as a CIL for enhancing device stability and photoelectric performance.
Main Methods:
- Synthesis of PEIE-Sn by chelating tin ions with polyethyleneimine ethoxylated.
- Fabrication of inverted NF-OPDs using PEIE-Sn as the CIL.
- Characterization of device performance, including photoelectric properties, stability under environmental stress (air, light, heat), dark current, and response speed.
Main Results:
- PEIE-Sn effectively optimizes cascade alignment and reduces interface defects in NF-OPDs.
- PEIE-Sn-based devices exhibit enhanced anti-environmental interference, suppressed dark current, and accelerated electron extraction/transmission.
- Unencapsulated PEIE-Sn-OPDs demonstrate high specific detection, fast response, and remarkable stability with minimal performance loss after environmental exposure.
- PEIE-Sn outperforms traditional CILs like ZnO, SnO2, and PEIE in both stability and photoelectric metrics.
Conclusions:
- Tin ion-chelation in PEIE-Sn provides excellent interface compatibility with NFAs, crucial for device stability.
- PEIE-Sn presents a promising strategy for stabilizing NF-OPDs, addressing a key challenge in organic photodiode technology.
- The developed interface layer significantly improves the operational lifetime and performance of unencapsulated organic photodiodes.
