期刊
ACS APPLIED ENERGY MATERIALS
卷 1, 期 2, 页码 765-774出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.7b00207
关键词
microspheres; TiO2; whispering gallery modes; DSSC; QDSSC; photoluminescence
资金
- DST-SERI [DST/TM/SERI/2K11/113]
Mesoporous TiO2 nanoparticles are excellent photoanodes for sensitized solar cells (SSC). However, a significant loss in the photoconversion efficiency (PCE) occurs due to the inefficient light absorption. Large Mie scattering from mesoporous micron-sized spheres could be used to enhance the absorption and hence the PCE. Here, we show that a composite comprising a TiO2 mesoporous microsphere with smooth surface (S mu S-TiO2) exhibiting whispering gallery modes (WGM) and a commercial TiO2 mesoporous nanoparticle (Degussa P25) with an optimum ratio (80:20 wt %) shows significant enhancement in PCE of DSSC and QDSSC devices. S mu S-TiO2 exhibits strong WGM as evidenced from the photoluminescence studies carried out using a laser with an excitation wavelength lambda(exc) = 325 nm. These microspheres sensitized with N719 dye or CdSe/CuInS2 QDs are shown to exhibit emission characteristics strongly coupled to WGM resulting in an enhanced PCE in SSC. Increases in PCE of similar to 24% in DSSC devices and 80-95% in QDSSC devices of 0.25 cm(2) area are demonstrated. Thus, TiO2 composite exhibiting WGM can be used as a generic photoanode to achieve maximum PCE for Gratzel type sensitized solar cells. This study suggests special class of solar cells called whisperonic solar cells.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据