Post-Processing Treatments in Hybrid Polymer/Titanium Dioxide Multilayer Solar Cells
Post-Processing Treatments in Hybrid Polymer/Titanium Dioxide Multilayer Solar Cells
复制标题
混合聚合物/二氧化钛多层太阳能电池的后处理处理
DOI：
10.1166/jno.2012.1379
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发表时间：
2012
影响因子：
0.6
通讯作者：
Ravirajan P
中科院分区：
文献类型：
--
作者：
Ravirajan P
We report on a study of post-processing treatments in hybrid solar cells based on poly(3-hexylthiophene) (P3HT) being in contact with nanocrystalline TiO2 films. The power conversion efficiency of the hybrid polymer/TiO2 solar cells is increased over three-fold through the simultaneous application of external bias voltage and UV illumination. These treatments enhance short-circuit current density, J SC, from 1 mA/cm2 to over 3 mA/cm2 under simulated air mass (AM) 1.5 conditions (100 mW cm–2 and lead to a peak external quantum efficiency of over 16%. The AM 1.5 open cir- cuit voltage reaches 0.47 V and the fill factor reaches 0.53, resulting in an overall power conversion efficiency of 0.74%. The improved performance following UV exposure is correlated to a slowing of over one order of magnitude in the dynamics of charge recombination as monitored by transient optical spectroscopy. We further demonstrate that while the UV radiation present in a simulated AM 1.5 solar spectrum is sufficient to cause the increase in the JSC and efficiency after two hours of exposure, no change results from exposure to the same spectrum when a UV blocking filter is used. We propose that UV exposure modifies the nature or density of surface trapping species in the nanocrystalline TiO2, resulting in reduced recombination rates and a higher efficiency of collection of photogenerated charges.
