期刊
ADVANCED SCIENCE
卷 5, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/advs.201800656
关键词
near-infrared emission; photoelectrochemical cells; pyramidal structures; quantum dots
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- Canada Research Chairs program
- government of China
- Sichuan province for a 1000 talent plan short term award
- Chinese Scholarship Council (CSC)
- UNESCO Chair in Materials and Technologies for Energy Conversion, Saving and Storage (MATECSS)
- University of Electronic Science and Technology of China
- National Natural Science Foundation of China [5171101224, NSFC-51272038]
- Natural Science Foundation of Shandong Province [ZR2018MB001]
- National Basic Research Program (973 Program) of China [2013CB933301]
Colloidal heterostructured quantum dots (QDs) are promising candidates for next-generation optoelectronic devices. In particular, giant core/shell QDs (g-QDs) can be engineered to exhibit outstanding optical properties and high chemical/photostability for the fabrication of high-performance optoelectronic devices. Here, the synthesis of heterostructured CuInSexS2-x (CISeS)/CdSeS/CdS g-QDs with pyramidal shape by using a facile two-step method is reported. The CdSeS/CdS shell is demonstrated to have a pure zinc blend phase other than typical wurtzite phase. The as-obtained heterostructured g-QDs exhibit near-infrared photoluminescence (PL) emission (approximate to 830 nm) and very long PL lifetime (in the microsecond range). The pyramidal g-QDs exhibit a quasi-type II band structure with spatial separation of electron-hole wave function, suggesting an efficient exciton extraction and transport, which is consistent with theoretical calculations. These heterostructured g-QDs are used as light harvesters to fabricate a photoelectrochemical cell, exhibiting a saturated photocurrent density as high as approximate to 5.5 mA cm(-2) and good stability under 1 sun illumination (AM 1.5 G, 100 mW cm(-2)). These results are an important step toward using heterostructured pyramidal g-QDs for prospective applications in solar technologies.
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