期刊
SCIENCE CHINA-MATERIALS
卷 59, 期 10, 页码 807-816出版社
SCIENCE PRESS
DOI: 10.1007/s40843-016-5103-7
关键词
hierarchical ZnO; nanosheet; nanorod; CdSe; quantum dot-sensitized solar cells
资金
- National Natural Science Foundation of China [51472274]
- Program of Guangzhou Science and Technology [2014J4100016, 201504010031]
- Pearl River S&T Nova Program of Guangzhou [2014J2200025]
- Natural Science Foundation of Guangdong Province [S2013030013474]
Two-dimensional (2D) ZnO nanosheet arrays were prepared via vanadium (V)-doping assisted hydrothermal method, and then the nanosheet was successfully converted to a nanorod-on-nanosheet ZnO hierarchical structure by treating with Na2S solution and subsequent hydrothermal reaction. Hierarchical films with different nanorod growth time (1-8 h) were prepared and their photovoltaic properties were also investigated after electrodeposition of CdSe quantum dots. For the hierarchical nanorod-on-nanosheet ZnO films, increasing the ZnO nanorod growth time can enormously enlarge the length of branched nanorods and light-scattering ability, resulting in better light-harvesting efficiency and higher photo-generated electron concentration, which leads to higher short-circuit current density (J(sc)) and open-circuit voltage (V-oc). However, further increasing nanorod growth time to 8 h leads to the over-dense coverage of nanorods, which is harmful for light-harvesting efficiency and leads to severe electron recombination, eventually diminishes the power conversion efficiency (PCE). With the optimized nanorod modification and Cu2S counter electrode, the PCE reaches a maximum value of 4.26%, which to the best of our knowledge, is among the highest PCE record for CdSe sensitized solar cells based on ZnO photoanodes.
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