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Published on: November 5, 2014
Highly efficient heterojunction solar cells enabled by edge-modified tellurene nanoribbons
1Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China. whuustc@ustc.edu.cn jlyang@ustc.edu.cn.
Edge-modifying zigzag tellurene nanoribbons (ZTNRs) creates stable 2D semiconductors with tunable band gaps. This engineering enables highly efficient heterojunction solar cells with a potential power conversion efficiency (PCE) reaching 22.6%.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Two-dimensional (2D) semiconductors are crucial for optoelectronics due to their unique properties.
- Tellurene exhibits excellent characteristics like a suitable band gap, high carrier mobility, and air stability.
- Band engineering of 2D materials offers a pathway to optimize their electronic and optical properties.
Purpose of the Study:
- To investigate the band engineering of zigzag tellurene nanoribbons (ZTNRs) through edge-modification.
- To explore the potential of modified ZTNRs in constructing highly efficient heterojunction solar cells.
- To determine the impact of edge-modification on the stability and electronic properties of ZTNRs.
Main Methods:
- First-principles density functional theory (DFT) calculations were employed.
- Edge-modification strategies were applied to ZTNRs.
- Heterojunctions were designed and analyzed for their electronic and optical properties.
Main Results:
- Edge-modification enhances the stability of ZTNRs.
- Halogen-modified ZTNRs exhibit suitable band gaps (1.35–1.53 eV) for solar light absorption.
- ZTNRs with tetragonal edges show stable band gaps irrespective of edge modification and ribbon width.
- Constructed heterojunctions display type 2 band alignments and small band offsets.
- Modified ZTNRs lead to reduced band gaps and enhanced sunlight absorption in heterojunction solar cells.
Conclusions:
- Edge-engineered ZTNRs are promising candidates for efficient optoelectronic devices.
- Halogen-modified ZTNRs can form the basis of high-performance heterojunction solar cells.
- Calculated maximum power conversion efficiency (PCE) for designed solar cells reached 22.6%.
