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High-Efficiency Photovoltaic Devices using Trap-Controlled Quantum-Dot Ink prepared via Phase-Transfer Exchange
Havid Aqoma1, Muhibullah Al Mubarok1, Wisnu Tantyo Hadmojo1
1Department of Chemistry, Kookmin University, 77 Jeongneung-ro, Seongbuk-gu, Seoul, 136-702, Republic of Korea.
Advanced Materials (Deerfield Beach, Fla.)
|March 8, 2017
Summary
Colloidal quantum dot (CQD) solar cells show improved efficiency using a novel CQD-ink and phase-transfer-exchange (PTE) method. This approach simplifies fabrication and reduces energy loss, boosting power conversion efficiency for next-generation photovoltaics.
Area of Science:
- Materials Science
- Nanotechnology
- Renewable Energy
Background:
- Colloidal-quantum-dot (CQD) photovoltaic devices offer low-cost, solution-processable solar power.
- Current limitations include high energy loss from surface trap states and complex fabrication.
- Achieving high power conversion efficiency (PCE) is crucial for commercialization.
Purpose of the Study:
- To develop a simplified fabrication process for CQD photovoltaic devices.
- To suppress surface trap states and reduce energy loss in CQD solar cells.
- To enhance the power conversion efficiency (PCE) of CQD photovoltaic devices.
Main Methods:
- Utilized a novel phase-transfer-exchange (PTE) method to create CQD-ink.
- Fabricated active layers via single-step coating using the CQD-ink.
- Investigated the impact of the PTE method on surface trap states and charge transport.
Main Results:
- CQD-ink enabled single-step fabrication and simultaneous suppression of surface trap states.
- CQD-ink photovoltaic devices achieved significantly higher PCEs (10.15% vs. 7.85% for control).
- Certified PCE reached 9.61%, with notably lower energy loss compared to other high-efficiency CQD devices.
Conclusions:
- The phase-transfer-exchange (PTE) method is an effective strategy for controlling trap states in CQDs.
- Single-step fabrication using CQD-ink enhances charge transport and device performance.
- This approach represents a significant advancement for high-efficiency, low-cost CQD solar cells.
