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Published on: January 10, 2017
High-Performance Ternary Organic Solar Cells with Controllable Morphology via Sequential Layer-by-Layer Deposition
Minrun Ren1, Guichuan Zhang1,2, Zhen Chen1
1State Key Laboratory of Luminescent Materials and Device, Institute of Polymer Optoelectronic Materials and Device, School of Materials Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510640, P. R. China.
A new layer-by-layer deposition method improves morphology control in ternary organic solar cells (OSCs). This strategy enhances charge transport and collection, leading to higher power conversion efficiencies (PCEs) for efficient energy harvesting.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Ternary blending in organic solar cells (OSCs) offers improved efficiency but faces challenges in morphology control.
- Conventional ternary blend films exhibit difficult-to-manage morphology, hindering device performance.
Purpose of the Study:
- To develop a general strategy for enhanced morphology control in ternary blend films for high-performance OSCs.
- To utilize sequential layer-by-layer (LbL) deposition for optimizing ternary blend film structure.
Main Methods:
- Sequential layer-by-layer (LbL) deposition of polymer donor and two nonfullerene small-molecule acceptors.
- Fabrication of ternary blend films with controlled morphology for OSCs.
Main Results:
- LbL films exhibit a bicontinuous interpenetrating network with high donor and acceptor crystallinity.
- Efficient charge generation, transport, and collection properties were observed in LbL ternary OSCs.
- Achieved power conversion efficiencies (PCEs) exceeding 11%, 13%, and 16% for specific material combinations.
Conclusions:
- The LbL deposition method provides superior morphology control for ternary blend films in OSCs.
- Ternary LbL OSCs show reduced sensitivity to blending ratios, facilitating optimization.
- This approach offers general guidelines for developing high-performance ternary OSCs with controlled morphology.
