柔性BiOI@Bi_2S_3异质结薄膜的SILAR制备及性能研究

SILAR construction and performance of BiOI@Bi_2S_3 heterojunction films on flexible ITO substrate

室温下,采用SILAR法在柔性ITO基底上合成BiOI纳米片阵列薄膜。为提高其光电化学性能,设计并制备了BiOI/Bi2S3、Bi2S3/BiOI杂化异质结薄膜。通过XRD、SEM及UV-VIS-NIR等对所得产物的形貌、晶体结构和光学性能进行研究。以纯BiOI,BiOI/Bi2S3和Bi2S3/BiOI作为工作电极,Pt/ITO/PET作为对电极,I-/I3-作为电解液,组装成柔性太阳能电池器件。通过太阳光模拟器测试其光电转化性能,得到性能较优的是Bi2S3/BiOI杂化薄膜所组装的柔性电池器件,其光电转化效率(η)为0.136%,短路电流(Isc)为0.597mA/cm2,开路电压(Voc)为0.376V,填充因子(FF)为0.293。

A modified successive ionic layer adsorption and reaction （SILAR） method was developed to fabricate BiOI nanoflake arrays on flexible ITO/PET substrates at room temperature. The morphology, crystal structure and optical property of as-prepared samples were characterized by XRD, SEM and UV-VIS-NIR spectra. In order to improve the pho- toelectrochemical property of BiOI based solar cell, the BiOI/Bi2S3 and Bi2S3/BiOI heterojunction films were prepared under the same conditions. The photovoltaic cells were assembled using the prepared BiOI, BiOI/Bi2S3 and Bi2S3/BiOI heterojunction films as the working electrodes and sputtering Pt/ITO/PET as the counter electrodes. A redox （I^-/I^3- ） electrolyte composed of 0.05 M I2, 0.5 M LiI, 0.3 M DMPII, and 0.5 M 4-TBP in 3-methoxy acrylonitrile was injected into the cell when measuring the I-V characteristics and the IPCE properties. A short circuit current density （ISC） of 0. 597 mA/ cm^2 , an open circuit voltage （Voc） of 0. 376 V, a fill factor （FF） of 0. 293 and conversion efficiency （η） of 0. 136% were obtained under the optimized condition.