Single‐crystalline CdS nanobelts demonstrate excellent field‐emission properties for the first time. Individual CdS nanobelts are assembled for high‐performance visible‐light photodetectors with an ultrafast response time of ∼20 μs and ultrahigh quantum efficiency of 1.9 × 107%. The results suggest a high potential of utilizing these CdS nanobelts as optoelectronic nanodevices.
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