In this study,a novel photovoltaic cell based on the Ti_(3)C_(2)T_(x) MXene/n-type silicon(n-Si)Schottky junction is developed by a simple solution-processed method of drop-casting the Ti_(3)C_(2)T_(x) MXene ethanol s...In this study,a novel photovoltaic cell based on the Ti_(3)C_(2)T_(x) MXene/n-type silicon(n-Si)Schottky junction is developed by a simple solution-processed method of drop-casting the Ti_(3)C_(2)T_(x) MXene ethanol suspension onto the surface of n-Si wafers and the subsequent natural drying in air.The demonstration device with a simple configuration of Ag(top electrode)/Ti_(3)C_(2)T_(x)/n-Si/In:Ga(back electrode)delivers a power conversion efficiency(PCE)of 5.70%with a short-circuit current density(Jsc)of 20.68 mA cm^(−2),open-circuit voltage(V_(oc))of 0.530 V and fill factor(FF)of 52.0%under AM 1.5G illumination.After treating the MXene layer with the SnCl_(2) aqueous solution,an improved PCE to 6.95%(J_(sc):23.04 mA cm^(−2);V_(oc):0.536 V;FF:56.2%)can be achieved because of the reduced light reflection,improved quality of junction and electrical contact,as well as the increased carrier lifetime/suppressed carrier recombination.Given the simple device configuration,facile preparation and huge potential for performance improvement,this work is believed to provide valuable exploration of developing novel solar cells.展开更多
To address the discrepancy between carrier collection and light absorption of organic solar cells caused by the limited carrier mobility and optical absorption coefficient for the normally employed organic photoactive...To address the discrepancy between carrier collection and light absorption of organic solar cells caused by the limited carrier mobility and optical absorption coefficient for the normally employed organic photoactive layers,a light management structure composed of a front indium tin oxide(ITO)nanograting and ultrathin Al layer inserted in between the photoactive layer and the electron transport layer(ETL)is introduced.Owing to the antireflection and light scattering induced by the ITO nanograting and the suppression of light absorption in the ETL by the inserted Al layer,the light absorption of the photoactive layer is significantly enhanced in a spectral range from 400 nm to 650 nm that also covers the main energy region of solar irradiation for the normally employed active materials such as the P3HT:PC_(61)BM blend.The simulation results indicate that comparing with the control device with a planar configuration of ITO/PEDOT:PSS/P3HT:PC_(61)BM(80-nm thick)/ZnO/Al,the short-circuit current density and power conversion efficiency of the optimized light management structure can be improved by 32.86%and 34.46%.Moreover,good omnidirectional light management is observed for the proposed device structure.Owing to the fact that the light management structure possesses the simple structure and excellent performance,the exploration of such a structure can be believed to be significant in fabricating the thin film-based optoelectronic devices.展开更多
基金financially supported by the Natural Science Foundation of Gansu(20JR10RA611)。
文摘In this study,a novel photovoltaic cell based on the Ti_(3)C_(2)T_(x) MXene/n-type silicon(n-Si)Schottky junction is developed by a simple solution-processed method of drop-casting the Ti_(3)C_(2)T_(x) MXene ethanol suspension onto the surface of n-Si wafers and the subsequent natural drying in air.The demonstration device with a simple configuration of Ag(top electrode)/Ti_(3)C_(2)T_(x)/n-Si/In:Ga(back electrode)delivers a power conversion efficiency(PCE)of 5.70%with a short-circuit current density(Jsc)of 20.68 mA cm^(−2),open-circuit voltage(V_(oc))of 0.530 V and fill factor(FF)of 52.0%under AM 1.5G illumination.After treating the MXene layer with the SnCl_(2) aqueous solution,an improved PCE to 6.95%(J_(sc):23.04 mA cm^(−2);V_(oc):0.536 V;FF:56.2%)can be achieved because of the reduced light reflection,improved quality of junction and electrical contact,as well as the increased carrier lifetime/suppressed carrier recombination.Given the simple device configuration,facile preparation and huge potential for performance improvement,this work is believed to provide valuable exploration of developing novel solar cells.
基金supported by the Natural Science Foundation of Gansu Province,China(Grant No.20JR10RA611)the Fundamental Research Funds for Central Universities,China(Grant Nos.lzujbky-2017-178 and lzujbky-2017-181).
文摘To address the discrepancy between carrier collection and light absorption of organic solar cells caused by the limited carrier mobility and optical absorption coefficient for the normally employed organic photoactive layers,a light management structure composed of a front indium tin oxide(ITO)nanograting and ultrathin Al layer inserted in between the photoactive layer and the electron transport layer(ETL)is introduced.Owing to the antireflection and light scattering induced by the ITO nanograting and the suppression of light absorption in the ETL by the inserted Al layer,the light absorption of the photoactive layer is significantly enhanced in a spectral range from 400 nm to 650 nm that also covers the main energy region of solar irradiation for the normally employed active materials such as the P3HT:PC_(61)BM blend.The simulation results indicate that comparing with the control device with a planar configuration of ITO/PEDOT:PSS/P3HT:PC_(61)BM(80-nm thick)/ZnO/Al,the short-circuit current density and power conversion efficiency of the optimized light management structure can be improved by 32.86%and 34.46%.Moreover,good omnidirectional light management is observed for the proposed device structure.Owing to the fact that the light management structure possesses the simple structure and excellent performance,the exploration of such a structure can be believed to be significant in fabricating the thin film-based optoelectronic devices.
