Carbon Quantum Dots-Coated Zinc Oxide as Electron Transport Layer for Inverted-Type Organic Solar Cells

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Chinese explanation / 中文解读

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Original abstract

Abstract Inverted organic solar cells (OSCs) which utilize zinc oxide (ZnO) as the electron transport layer (ETL) encounter performance limitations due to intrinsic surface defects within pristine ZnO films.These defects act as trap-assisted recombination centers, causing charge leakage and hindering efficient electron extraction, particularly under low-intensity indoor illumination. In this study, carbon quantum dots (CQDs) were incorporated as an interfacial modifier to passivate ZnO surface defects and improve interfacial compatibility with the P3HT: PCBM photoactive layer. After CQDs incorporation, a smoother surface, lower recombination losses, and more favorable energylevel alignment at the interface were observed. As a result, the power conversion efficiency (PCE) improved from 1.83% to 2.36% under 1-sun illumination and from 3.57% to 4.77% under white LED lighting. The CQDs modification technique is a potential way to make efficient, low-cost, and environmentally friendly indoor OSCs since it is simple, scalable, and works with solutionprocessed fabrication.

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