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Influence of Surface Modifier Molecular Structures on the Photovoltaic Performance of Sb <sub/>2</sub> S <sub/>3</sub> Sensitized TiO <sub/>2</sub> Nanorod Array Solar Cells
摘要： In this paper, Sb2S3 sensitized TiO2 nanorod arrays are prepared by the pyrolysis of 1.2 M antimony-thiourea complex solution in DMF at 270 ℃ for 10 min. Various surface modifiers with different functional groups and carbon numbers of C10H21PO3H2, C12H25SO3Na, C3H7COOH, C5H11COOH, C7H15COOH, C11H23COOH, C13H27COOH, C15H31COOH and C17H35COOH are applied to modify Sb2S3 sensitized TiO2 nanorod arrays. The corresponding solar cells are fabricated, and their photovoltaic performances are evaluated. To the different functional group surface modifiers, the improvement of functional group on photovoltaic performance is the order of -COOH > -PO3H2 > -SO3Na. To the different carbon number (4-18) surface modifiers, RCOOH with carbon number range of 8-12 exhibit better photovoltaic performance. Moreover, the Sb2S3 sensitized TiO2 nanorod array solar cells with C11H23COOH achieve the best photoelectric conversion efficiency (PCE) of 5.37 % with the open-circuit voltage (Voc) of 0.53 V, short-circuit current density (Jsc) of 16.98 mA?cm-2, fill factor (FF) of 60.66 % and the average PCE of 5.11±0.21 % with the Voc of 0.52±0.01 V, Jsc of 16.65±0.24 mA?cm-2, FF of 58.93±1.21 %. The PCE of 5.37 % corresponding to the use of spiro-OMeTAD as the hole transporting material is a relatively high PCE for Sb2S3 solar cells.
关键词： spiro-OMeTAD,Sb2S3 sensitized TiO2 nanorod array,solar cell,surface modifier
更新于2025-09-23 15:19:57
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Niobium doped TiO2 nanorod arrays as efficient electron transport materials in photovoltaic
摘要： One-dimensional (1-D) rutile TiO2 nanorod arrays (NRAs) synthesized by a hydrothermal method suffer from low electrical conductivity and large amounts of surface defects, hindering their further applications. Nb doping is thus introduced to modify their electronic properties. Results indicate that light Nb doping reduces rod nanosizes, increases electron concentrations, decreases surface defective oxides and lowers conduction band of the TiO2 NRAs, while heavy doping induces transformations of morphologies and crystalline orientations as well as occurrences of compositional deviations and low oxidative states of Ti3t. After 0.1 mol% and 1 mol% Nb incorporations, device efficiencies are substantially improved by ~16% and ~33% for the model perovskite and dye-sensitized solar cells, respectively, which are ascribed to reduced recombination at the perovskite/TiO2 interfaces (e.g. charge lifetime increasing from 62 μs to 107 μs) and improved electron transport through the photoanode of TiO2 NRAs (e.g. electron diffusion length increasing from ~14 μm to ~50 μm). Our study verifies that Nb doped 1-D TiO2 NRAs are versatile electron transporting materials in different kinds of emerging solar cells, and are also potential for other fields including photocatalysis, sensors and batteries etc.
关键词： TiO2 nanorod array,Dye-sensitized solar cell,Niobium doping,Charge transport,Perovskite solar cell,Recombination
更新于2025-09-19 17:13:59