Layer-by-Layer Self-Assembly of Hollow Nitrogen-Doped Carbon Quantum Dots on Cationized Textured Crystalline Silicon Solar Cells for an Efficient Energy Down-Shift
- Authors
- Ali, Mumtaz; Riaz, Rabia; Bae, Soohyun; Lee, Hae-Seok; Jeong, Sung Hoon; Ko, Min Jae
- Issue Date
- 4-3월-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- nitrogen-doped carbon quantum dots; crystalline silicon solar cells; cationization; layer-by-layer; self-assembly energy down-shift; photoluminescence
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.12, no.9, pp.10369 - 10381
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 12
- Number
- 9
- Start Page
- 10369
- End Page
- 10381
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57326
- DOI
- 10.1021/acsami.9b21087
- ISSN
- 1944-8244
- Abstract
- Enhancing the efficiency of the crystalline silicon solar cell (c-Si SC) by coating the energy shifting layer with quantum dots (QDs) is a recent approach to efficiently utilize the high-energy spectrum of light. Carbon QDs are an attractive candidate for such applications; however, a small Stokes shift and nonuniform coating due to high aggregation are the bottlenecks to fully utilize their potential. For this purpose, here, we propose a layer-by-layer self-assembled uniform coating of eco-friendly red-emissive hollow nitrogen-doped carbon QDs (NR-CQDs) as an efficient energy-down-shifting layer. A unique hollow and conjugated structure of NR-CQDs was designed to achieve a large Stokes shift (UV-excited red emission) with a quantum yield (QY) comparable to Cd/Pb QDs. A highly uniform coating of intrinsically negatively charged NR-CQDs on c-Si SCs was achieved by cationizing the c-Si SC by bovine serum albumin (BSA) under mildly acidic conditions. By an opposite-charge-assisted, self-assembled overlayer, the short-circuit current density (J(sc)) and power-conversion efficiency were increased by 5.8%, which is attributed to the large Stokes shift (255 nm) and high QY. Blue-emissive undoped carbon QDs were synthesized for comparison with the proposed NR-CQDs to elucidate the significance of the novel proposed structure.
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Collections - Graduate School of Energy and Environment (KU-KIST GREEN SCHOOL) > Department of Energy and Environment > 1. Journal Articles
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