化学浴制备全固态Sb₂S₃敏化TiO₂纳米棒阵列太阳电池研究

Preparation of All-Solid-State Sb₂S₃ Sensitized TiO₂ Nanorod Array Solar Cells by Chemical Bath Deposition Method

摘要: 本文利用水热法在覆盖有TiO₂致密层的FTO导电玻璃上生长出直径为20 nm、长度为570 nm、面密度为560 μm⁻²的TiO₂纳米棒阵列。接着使用低温化学浴沉积法，以SbCl₃作为Sb源，Na₂S₂O₃作为S源，在TiO2纳米棒阵列上成功沉积了Sb₂S₃薄膜。并以spiro-OMeTAD作为固态电解质组装了全固态Sb₂S₃敏化TiO₂纳米棒阵列太阳电池。系统研究了所得Sb₂S₃敏化TiO₂纳米棒阵列的形貌、结晶性和光学吸收，以及相应太阳电池的光伏性能。结果表明，当Sb₂S₃薄膜在450℃下退火8 min时，Sb₂S₃由无定形转变为辉锑矿相，其吸收开端红移到750 nm，相应太阳电池的光电转换效率达到了2.5%。

Abstract: In this paper, the TiO₂ nanorod arrays with the diameter of 20 nm, the length of 570 nm and the areal-density of 560 μm⁻² were grown on the TiO₂ compact layer covered FTO conductive glass by a hydrothermal method. The Sb₂S₃ thin film was successfully deposited on TiO₂ nanorod arrays by the low-temperature chemical bath deposition method using SbCl₃ as antimony source and Na₂S₂O₃ as sulfide source. The all-solid-state Sb₂S₃ sensitized TiO₂ nanorod array solar cell was fabricated using spiro-OMeTAD as the solid-state electrolyte. The morphology, crystallinity and optical absorption of the Sb₂S₃ thin film were investigated and the photovoltaic performance of the corresponding Sb₂S₃ sensitized solar cells was evaluated. The results revealed that the crystalline phase of Sb₂S₃ thin film was transformed from the amorphous to stibnite phase, and the absorption onset of Sb₂S₃ thin film exhibited a red-shift to 750 nm when the Sb₂S₃ thin film was annealed at 450˚C for 8 min. The corresponding solar cells achieved the PCE of 2.5%.