Effect of an adsorbent on recombination and band-edge movement in dye-sensitized TiO2 solar cells:: Evidence for surface passivation
Effect of an adsorbent on recombination and band-edge movement in dye-sensitized TiO2 solar cells:: Evidence for surface passivation
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DOI：
10.1021/jp0607364
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发表时间：
2006-06-29
影响因子：
3.3
通讯作者：
Frank, Arthur J.
中科院分区：
文献类型：
--
作者：
Kopidakis, Nikos;Neale, Nathan R.;Frank, Arthur J.
研究了吸附剂胍对染料敏化纳米晶太阳能电池开路光电压的影响机理。用瞬时光电压法测量了胍阳离子对复合速率和带边移动的影响。当电解液中存在鸟粪时，复合变慢约20倍。同时，吸附剂使带边向正电化学势下移100 mV。带边下移和复合减慢的共同作用，导致了开路光电电压的整体改善。
The mechanism by which the adsorbent guanidinium affects the open-circuit photovoltage of dye-sensitized TiO2 nanocrystalline solar cells was investigated. The influence of the guanidinium cation on the rate of recombination and band-edge movement was measured by transient photovoltage. When guanidinium is present in the electrolyte recombination becomes slower by a factor of about 20. At the same time, the adsorbent causes the band edges to move downward, toward positive electrochemical potentials, by 100 mV. The collective effect of both a downward shift of the band edges and slower recombination, owing to the presence of guanidinium, results in an overall improvement in the open-circuit photovoltage.