摘要
Colloidal core/shell quantum dots(QDs)with environment-friendly feature and controllable optoelectronic properties are promising building blocks in emerging solar technologies.In this work,we rationally design and tailor the eco-friendly CuInSe(CISe)/ZnSe core/shell QDs by Mn doping and stoichiometric optimization(i.e.,molar ratios of Cu/In).It is demonstrated that Mn doping in In-rich CISe/ZnSe core/shell QDs can effectively engineer the charge kinetics inside the QDs,enabling efficient photogenerated electrons transfer into the shell for retarded charge recombination.As a result,a solar-driven photoelectrochemical(PEC)device fabricated using the optimized Mn-doped In-rich CISe/ZnSe core/shell QDs(Cu/In ratio of 1/2)exhibits improved charge extraction and injection,showing a~3.5-fold higher photocurrent density than that of the pristine CISe/ZnSe core/shell QDs under 1 sun AM 1.5G illumination.The findings indicate that transition metal doping in“green”nonstoichiometric core/shell QDs may offer a new strategy for achieving high-efficiency solar energy conversion applications.
基金
X.T.acknowledges the support from the National Key Research and Development Program of China(No.2019YFE0121600)
the National Natural Science Foundation of China(Nos.22105031 and 62011530131)
Sichuan Science and Technology Program(No.2021YFH0054)
Innovation Group Project of Sichuan Province(No.20CXTD0090)
Z.M.W.acknowledges the National Key Research and Development Program of China(No.2019YFB2203400)and the“111 Project”(No.B20030).
