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Remote trap passivation in colloidal quantum dot bulk nano-heterojunctions and its effect in solution-processed solar
Arup K Rath1, F Pelayo Garcia de Arquer, Alexandros Stavrinadis
1ICFO - Institut de Ciéncies Fotóniques, Mediterranean Technology Park, Av. Carl Friedrich Gauss, 3, 08860, Castelldefels, Barcelona, Spain; CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India.
Colloidal quantum dot solar cells achieve higher efficiency using a bulk nano-heterojunction (BNH) structure. This design improves charge collection and reduces recombination, boosting performance in solar energy applications.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Colloidal quantum dots (CQDs) are promising for solar cell applications.
- Efficient charge extraction and minimizing recombination are critical for high-performance solar cells.
Purpose of the Study:
- To enhance charge collection and suppress trap recombination in CQD solar cells.
- To investigate the performance benefits of a bulk nano-heterojunction (BNH) structure compared to traditional bilayer designs.
Main Methods:
- Fabrication of CQD solar cells utilizing a bulk nano-heterojunction (BNH) architecture.
- Blending of p-type and n-type materials at the nanoscale within the BNH structure.
- Performance characterization of BNH devices against bilayer counterparts.
Main Results:
- The BNH structure significantly improved charge collection efficiency.
- Suppressed trap recombination was observed in the BNH devices.
- BNH devices exhibited higher photocurrents and open-circuit voltages compared to bilayer devices.
Conclusions:
- The bulk nano-heterojunction (BNH) structure is an effective strategy for enhancing CQD solar cell performance.
- Trap passivation mechanisms within the BNH contribute to improved device efficiency.
- BNH architecture offers a pathway towards more efficient and stable colloidal quantum dot solar cells.
