Carbon materials for dye-sensitized solar cells (DSSC) have aroused much attention recently due to their low cost, wonderful chemical stability and outstanding catalytic activity, etc. As China is a large agricultural country, in consideration of environmental protection and low cost, two common green vegetables, including cucumber and green pepper, are employed to prepare carbon quantum dots (CQD) by hydrothermal method, and simultaneously the residues are carbonized to obtain carbon particles (CP) in this study. The optical performances of the as-prepared CQD were acquired through UV-Vis and PL tests, showing that the CQD were suitable as sensitizers for DSSC. Thereby CQDbased DSSC with Pt counter electrode (CE) were experimentally fabricated, yielding the power conversion efficiency (PCE) of 0.21% and 0.28% respectively under AM 1.5 one sun illumination. Meanwhile, the CP were coated on FTO as CE for DSSC, and the favorable electrochemical properties of the CP-based CE were measured by EIS and Tafel. Therefore the CP-based DSSC with N719 sensitizer were constructed, and achieved the PCE of 1.45% and 1.40% respectively. The above results distinctly present the photovoltaic applications of CQD and CP concurrently derived from green vegetables as sensitizer and counter electrode for DSSC, which indicate the prospect for the realization of high-performance photovoltaic cells from low cost and environmentally friendly natural products
A transparent conductive metal mesh film (TCMMF) was successfully fabricated by a low-cost and simple process. Firstly, the crack mask pattern is obtained after a certain heat treatment process, based on a glass substrate coated with egg-white. Then, a TCMMF was fabricated in combination with a series of processes such as metal deposition and mask removal. In this paper, the film formation mechanism and performance of the TCMMF based on random crack templates are studied, and the TCMMF have also been used in perovskite solar cells (PSCs).The results showed that the TCMMF’s transmittance is more than 90% in the UV-visible range and infrared-visible range. The TCMMF’s surface resistance measured by the four probe method is 20 Ω/□. The performance of the PSCs based on the TCMMF can be comparable to that of the PSCs based on ITO, with a photoelectric conversion efficiency of 13.8%. This provides a possibility for the application of TCMMF in photovoltaic and photovoltaic fields.
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