期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 9, 期 3, 页码 1083-1094出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ee03165f
关键词
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资金
- Bavaria on the Move'' initiative of the state of Bavaria
- Bavaria Research Foundation (BFS) [1006-11]
- Cluster of Excellence Engineering of Advanced Materials'' at the University Erlangen-Nurnberg
- Federal Ministry for Economic Affairs and Energy (MNPQ program) [BMWI 11/12]
- DFG
We present colloidally stable and highly luminescent ZnxCd1-xS:Mn/ZnS core-shell nanocrystals (NCs) synthesized via a simple non-injection one-pot, two-step synthetic route, which can be easily upscaled. A systematic variation of the reaction component, parameters and thickness of the ZnS shell yielded doped nanocrystals with a very high photoluminescence quantum yield (Phi(pl)) of 70%, which is the highest value yet reported for these Mn-doped sulfide-semiconductor NCs. These materials can be synthesized with high reproducibility in large quantities of the same high quality, i.e., the same Phi(pl) using accordingly optimized reaction conditions. The application of these zero-reabsorption high quality NCs in the light conversion layers, deposited on top of a commercial monocrystalline silicon (mono-Si) solar cell, led to a significant enhancement of the external quantum efficiency (EQE) of this device in the ultraviolet spectral region between 300 and 400 nm up to ca. 12%. EQE enhancement is reflected by an increase in the power conversion efficiency (PCE) by nearly 0.5 percentage points and approached the theoretical limit (0.6%) expected from down-shifting for this Si solar cell. The resulting PCE may result in a BoM (bill of materials) cost reduction of app. 3% for mono-Si photovoltaic modules. Such small but distinct improvements are expected to pave the road for an industrial application of doped semiconductor NCs as cost-effective light converters for silicon photovoltaic (PV) and other optoelectronic applications.
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