Mesoporous TiO 2 (m-TiO 2 ) is widely used in the preparation of perovskite solar cells (PSCs) due to its fast carrier transfer and strong light scattering capacity, but the trap states of TiO 2 will cause serious recombination, which will affect the performance of the PSCs to a great extent. Surface treatment is an efficient way to passivate the surface defects of TiO 2 and improve the performance of devices. In this study, we introduce a TiO 2 composite treatment strategy that treats TiO 2 films with low-concentration hydrochloric (HCl) solution and ultraviolet ozone (UVO). The composite treatment has no adverse impact on the structure of TiO 2 , which can be confirmed by X-ray diffraction (XRD), atomic force microscope (AFM), and scanning electron microscope (SEM) measurement. X-ray photoelectron spectroscopy (XPS) shows a 4.62% decrease of surface oxygen vacancies in TiO 2 films, which means the composite treatment can reduce the surface defects resulting from oxygen vacancies. To further explore the carrier transfer performance of treated TiO 2 films, the time-resolved photoluminescence (TRPL) spectroscopy and space charge-limited currents (SCLC) measurement were used. The measurements show a decrease to 59.03 ns of average charge carrier lifetime and a 0.023 V reduction of limit voltage, indicating a stronger electron extraction capability and less defect states. Finally, we achieve a power conversion efficiency (PCE) of 18.9% compared to 17.6% for the control PSCs.
Mo Yang,Liangru Wu,Chongjiang Cao,Suya Wang,Dongmei Zhang
Summary With the increase in global welfare, metabolic syndrome-related diseases seriously disrupt our quality of life. Balanced diet with low calories, low glycaemic index, and high dietary fibre such as bamboo shoot fibre is needed. Functional properties of dietary fibre can be improved by processing methods. Therefore, we compared the effect of three processing methods (high-speed shear dispersing, enzyme treatment and combined treatment) on the characteristics and functions of bamboo shoot fibres. Combined treatment resulted in high SDF content (10.15%), adsorption capacity of glucose (4.45–18.18 mmol g −1 ), nitrite ion (505.49 μg g −1 [pH 2.0]), and cholesterol (333.72 μg g −1 [pH 2.0]). FTIR revealed that hydroxyl groups, sugar methylene and benzene rings of aromatic compounds existed in the treated bamboo shoots. The particle size (D 50 ) decreased from 383.90 to 30.65 μm. Honeycomb-like structure was also observed through SEM. Thus, proper processing of bamboo shoot fibres can improve their functions as food ingredients.
危险品化学品经营许可证（带存储）