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Morphology Control for Fully Printable Organic–Inorganic Bulk-heterojunction Solar Cells Based on a Ti-alkoxide and Semiconducting Polymer
Published on: January 10, 2017
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Efficient Type-II Heterojunction Nanorod Sensitized Solar Cells Realized by Controlled Synthesis of Core/Patchy-Shell
Sangheon Lee1, Joseph C Flanagan2, Jaewook Kim1
1WCU Hybrid Materials Program, Department of Materials Science and Engineering, Research Institute of Advanced Materials , Seoul National University , Seoul 08226 , Korea.
ACS Applied Materials & Interfaces
|May 9, 2019
Summary
Core/patchy-shell cadmium selenide/cadmium selenide telluride (CdSe/CdSe$_{x}$Te$_{1-x}$) heterojunction nanorods (HNRs) boost solar cell efficiency. This novel structure enhances photocurrent and reduces recombination for improved photovoltaic performance.
Area of Science:
- Materials Science
- Nanotechnology
- Photovoltaics
Background:
- Type-II heterojunction nanorods (HNRs) are promising for sensitized solar cells.
- Optimizing the interface and shell coverage is crucial for photovoltaic performance.
Purpose of the Study:
- To investigate the application of core/patchy-shell CdSe/CdSe$_{x}$Te$_{1-x}$ HNRs in sensitized solar cells.
- To understand how the unique structure impacts photovoltaic performance and charge dynamics.
Main Methods:
- Synthesis of core/patchy-shell CdSe/CdSe$_{x}$Te$_{1-x}$ HNRs.
- Cosensitization with cadmium sulfide (CdS) using successive ionic layer adsorption and reaction.
- Photovoltaic performance characterization and one-diode model analysis.
Main Results:
- The core/patchy-shell structure significantly improved photovoltaic performance compared to other HNRs.
- Cosensitization with CdS further enhanced power conversion efficiency.
- Optimized devices achieved 5.47% efficiency (5.89% with modified electrodes).
Conclusions:
- The fine-tuned core/patchy-shell structure increases photocurrent via a large type-II heterointerface.
- Reduced recombination and facile electron extraction are attributed to the open CdSe core.
- This work presents a new benchmark for anisotropic colloidal heterostructures in light-harvesting applications.
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