Understanding and removing surface states limiting charge transport in TiO(2) nanowire arrays for enhanced optoelectronic device performance.
Understanding and removing surface states limiting charge transport in TiO(2) nanowire arrays for enhanced optoelectronic device performance.
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了解并消除限制 TiO2 纳米线阵列中电荷传输的表面态,以增强光电器件性能
DOI:
10.1039/c5sc04076k
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发表时间:
2016-03-01
期刊:
影响因子:
8.4
通讯作者:
Feng X
中科院分区:
文献类型:
--
作者:
Sheng X;Chen L;Xu T;Zhu K;Feng X
An effective wet-chemistry approach is demonstrated to minimize the trap states that limit electron transport in rutile TiO2 nanowire arrays, this leads to an over 20-fold enhancement in the electron diffusion coefficient. Charge transport within electrode materials plays a key role in determining the optoelectronic device performance. Aligned single-crystal TiO2 nanowire arrays offer an ideal electron transport path and are expected to have higher electron mobility. Unfortunately, their transport is found not to be superior to that in nanoparticle films. Here we show that the low electron transport in rutile TiO2 nanowires is mainly caused by surface traps in relatively deep energy levels, which cannot be removed by conventional approaches, such as oxygen annealing treatment. Moreover, we demonstrate an effective wet-chemistry approach to minimize these trap states, leading to over 20-fold enhancement in electron diffusion coefficient and 62% improvement in solar cell performance. On the basis of our results, the potential of TiO2 NWs can be developed and well-utilized, which is significantly important for their practical applications.
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通讯作者:
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