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High-Efficiency PbS Quantum-Dot Solar Cells with Greatly Simplified Fabrication Processing via "Solvent-Curing"
Kunyuan Lu1, Yongjie Wang1, Zeke Liu1
1Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu, P. R. China.
Researchers simplified lead sulfide (PbS) quantum-dot (QD) solar cell fabrication using acetonitrile (ACN) as a rinsing solvent. This method reduces steps and enhances efficiency to 11.21% for scalable, low-cost photovoltaics.
Area of Science:
- Materials Science
- Photovoltaics
- Nanotechnology
Background:
- Lead sulfide (PbS) quantum dots (QDs) offer potential for low-cost, solution-processed solar cells.
- Current fabrication methods involve numerous deposition and rinsing steps, hindering scalability.
Purpose of the Study:
- To simplify the fabrication process for PbS QD solar cells.
- To improve the efficiency and scalability of QD solar cell manufacturing.
Main Methods:
- Replaced methanol with acetonitrile (ACN) as the rinsing solvent during film deposition.
- Utilized ACN's aprotic nature to minimize trap states and its solvent properties to cure film cracks.
Main Results:
- Achieved thick, dense films with significantly fewer deposition steps (three for the active layer).
- Obtained a certified power conversion efficiency of 11.21%, the highest for PbS QD solar cells with solid-state ligand exchange.
- Demonstrated a simplified processing technique suitable for scalable manufacturing.
Conclusions:
- Acetonitrile is an effective solvent for simplifying PbS QD solar cell fabrication.
- The simplified process leads to higher efficiency and offers a pathway for low-cost printing of optoelectronic devices.
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