Full
WANG Di (1993-), female, Master candidate. E-mail: 2448594339@qq.com
Outline
In quantum dot sensitized solar cells (QDSCs), many tiny cracks appear in porous titanium dioxide (TiO2) photoanode film during sintering process, which seriously blocks electron transport, leading to the significant decrease of solar cell performance. Multi-walled carbon nanotubes (MWCNTs) with the unique tuber structure and excellent electrical conductivity were used to modify the micro-cracks structure in TiO2 photoanode films. The effect of mass fraction (i.e., 0%, 0.01%, 0.05%, 0.1% and 0.5%) of MWCNTs on the property of QDSCs photoanode was investigated. The crystal phase and micromorphology of photoanodes were characterized. According to the morphology analysis results, moderate MWCNTs and TiO2 nanocrystals are uniformly mixed, and MWCNTs penetrated the micro-cracks in photoanode films. However, excess MWCNTs would aggregate into clusters that introduce many defects. CdS and ZnS quantum dots (QDs) were prepared on the above-mentioned photoanodes by a successive ionic layer adsorption and reaction (SILAR) method. QDSCs were assembled using QDs sensitized MWCNTs/TiO2 photoanodes, CuS as a counter electrode and a polysulfide electrolyte as an electrolyte, and its volt-ampere characteristic (J-V) curve was measured. The results show that QDSCs with 0.05% MWCNTs/TiO2 photoanode have the optimum photoelectric performance (i.e., the open-circuit voltage (Voc) of 0.65 V, the short-circuit current density (Jsc) of 11.51 mA/cm2 and the power conversion efficiency (PCE) of 3.14%.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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