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Surface plasmon enhanced organic solar cells with a MoO3 buffer layer
Zisheng Su1, Lidan Wang, Yantao Li
1State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences , Changchun 130033, P. R. China.
ACS Applied Materials & Interfaces
|December 11, 2013
Summary
This study demonstrates high-efficiency organic solar cells using silver nanoparticles for enhanced performance. The novel approach significantly boosts power conversion efficiency by leveraging surface plasmon resonance.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Organic solar cells (OSCs) offer a promising alternative to silicon-based photovoltaics due to their flexibility and low-cost fabrication.
- Achieving high power conversion efficiency (PCE) in small molecular bulk heterojunction (BHJ) OSCs remains a key challenge.
- Surface plasmon resonance (SPR) has emerged as a viable strategy to enhance light absorption and charge carrier dynamics in OSCs.
Purpose of the Study:
- To investigate the effect of silver nanoparticles (Ag NPs) on the performance of 1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane:C70 BHJ OSCs.
- To optimize the integration of Ag NPs as a surface plasmon enhancer within the OSC architecture.
- To elucidate the mechanisms responsible for the efficiency enhancement.
Main Methods:
- Fabrication of BHJ OSCs using a small molecule donor (1,1-bis-(4-bis(4-methyl-phenyl)-amino-phenyl)-cyclohexane) and a C70 acceptor.
- Incorporation of a molybdenum trioxide (MoO3) anode buffer layer.
- Deposition of thermally evaporated silver nanoparticles (Ag NPs) to induce surface plasmon enhancement.
- Performance characterization including current density-voltage (J-V) measurements and external quantum efficiency (EQE) analysis.
Main Results:
- The optimized OSC device incorporating Ag NPs achieved a power conversion efficiency (PCE) of 5.42%.
- This represents a significant 17% improvement in PCE compared to the reference device without Ag NPs.
- Enhanced conductivity and increased light absorption were observed in the Ag NP-modified devices.
Conclusions:
- Surface plasmon enhancement using Ag NPs is an effective strategy for improving the efficiency of small molecular BHJ OSCs.
- The localized surface plasmon resonance of Ag NPs contributes to enhanced charge carrier transport and light harvesting.
- This work highlights the potential of nanoscale plasmonic materials for advancing organic photovoltaic technology.
