Sánchez-García Mario Alberto, Bokhimi Xim, Maldonado-Álvarez Arturo, Jiménez-González Antonio Esteban
Instituto de Física, Universidad Nacional Autónoma de México (IF-UNAM), Apartado Postal 20-364, México, D.F., 04510, México,
Nanoscale Res Lett. 2015 Dec;10(1):991. doi: 10.1186/s11671-015-0991-3. Epub 2015 Jul 29.
Anatase nanoparticles were synthesized from a titanium isopropoxide solution using a hydrothermal process at different pressures in an autoclave system while keeping the volume of the solution constant. As the autoclave pressure was increased from 1 to 71 atm (23 to 210 °C), the crystal size in the nanoparticles increased from 9 to 13.8 nm. The anatase nanoparticles were used to build dye-sensitized solar cells (DSSC). Mesoporous films of this oxide were deposited over conducting SnO2:F substrates using the screen-printing technique and then annealed at 530 °C at 1 atm of air pressure. The morphology of the mesoporous film surface of anatase, studied using scanning electron microscopy, revealed that the crystal size and pore distribution were functions of the pressure conditions. The energy band gap of the films as a function of the crystal size exhibited quantum effects below 11.8 nm. The effects of the anatase synthesis conditions and properties of the mesoporous film on the DSSC-type solar cell parameters, η%, V OC, J SC, and FF, were also investigated: the mesoporous anatase films prepared at 200 °C (54 atm of pressure in the autoclave) and annealed at 530 °C in air generated the best solar cell, having the highest conversion efficiency.
采用水热法，在高压釜系统中于不同压力下由异丙醇钛溶液合成锐钛矿纳米颗粒，同时保持溶液体积恒定。随着高压釜压力从1个大气压增加到71个大气压（23℃至210℃），纳米颗粒中的晶体尺寸从9纳米增加到13.8纳米。这些锐钛矿纳米颗粒被用于构建染料敏化太阳能电池（DSSC）。使用丝网印刷技术将这种氧化物的介孔膜沉积在导电的SnO2:F衬底上，然后在1个大气压的空气压力下于530℃退火。通过扫描电子显微镜研究锐钛矿介孔膜表面的形态，结果表明晶体尺寸和孔隙分布是压力条件的函数。薄膜的能带隙作为晶体尺寸的函数在11.8纳米以下表现出量子效应。还研究了锐钛矿合成条件和介孔膜性质对DSSC型太阳能电池参数η%、VOC、JSC和FF的影响：在200℃（高压釜中压力为54个大气压）制备并在空气中于530℃退火的介孔锐钛矿膜产生了性能最佳的太阳能电池，具有最高的转换效率。
