How graphene strengthened molecular photoelectric performance of solar cells: A photo current-voltage assessment.

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Date: Jan. 1, 2021
From: Solar Energy(Vol. 213)
Publisher: Elsevier Science Publishers
Document Type: Report; Brief article
Length: 334 words

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Abstract :

Keywords Graphene quantum dots; Dye-sensitized solar cells; Photoelectric properties; Tuning LUMO levels Highlights * One global evaluating I-V model in graphene quantum dot sensitized solar cells have been built. * The micro-mechanism that GQDs enhance molecular photoelectric performance have been found. * Through the strategy of modifying acceptor to tune molecular LUMO level, high efficiency dyes have been selected. Abstract A comprehensive prediction for molecular power conversion efficiency and designing novel sensitizers are effective strategies for preparing highly efficient dye-sensitized solar cell devices. In this work, four high-efficiency D-[pi]-A type triazatruxene (TAT) based organic dyes have been designed by changing spacers and anchoring groups of the reference molecule. A global evaluating model that illustrates the micro-mechanism of enhanced molecular photoelectric performances through importing graphene quantum dots (GQDs) was built. Upon incorporating GQDs, an obvious absorption peak with high molar extinction coefficients appeared around the ultraviolet region. Furthermore, molecular light-harvesting efficiency (LHE) in the visible region has increased, and molecular charge transfer performance enhanced, and molecular regeneration ability improved, which contributed to the improved photocurrent (Jsc) and power conversion efficiency (PCE). Molecular ZL003 through the global evaluating model showed (Jsc = 19.03 mA cm.sup.-2, Voc = 0.874 V, PCE = 14.5%) are in accordance with the experimental data (Jsc = 19.74 mA cm.sup.-2, Voc = 0.957 V, PCE = 13.4%). The model can provide a basis for evaluating molecular photoelectric performance. The micro-mechanism that the GQDs enhance molecular photoelectric performances has been revealed in the framework of GQDs photo current-voltage evaluating model. Author Affiliation: (a) College of Science, Northeast Forestry University, Harbin 150040, Heilongjiang, China (b) Department of Physics, Liaoning University, Shenyang 110036, Liaoning, China (c) Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, 211816 Nanjing, China * Corresponding author. Article History: Received 16 September 2020; Revised 9 November 2020; Accepted 11 November 2020 Byline: Dongpeng Zhao (a), Reza Medi Saputra (a), Peng Song (b), Yanhui Yang (c), Yuanzuo Li [yzli@nefu.edu.cn] (a,*)

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Gale Document Number: GALE|A648932525