CAJ | 학술논문

结合瞬态光伏与表面光声技术,研究介孔掺镧nano-TiO_2光生载流子分离与复合过程及其能量转换机制.结果表明:锐钛矿中两种不同光伏特性的缺陷态具有光生载流子扩散距离短,复合速度快的特点:镧掺杂增加体缺陷态对于光伏效应的贡献,但在某种程度上抑制主带隙的电荷分离;模板剂种类对于主带隙电子.空穴对的分离与复合过程,以及亚带隙无辐射跃迁引起的晶格振动均有显著的影响.结果证实了样品表面光声与瞬态光伏现象之间存在明显的能量互补关系.
결합순태광복여표면광성기술,연구개공참란nano-TiO_2광생재류자분리여복합과정급기능량전환궤제.결과표명:예태광중량충불동광복특성적결함태구유광생재류자확산거리단,복합속도쾌적특점:란참잡증가체결함태대우광복효응적공헌,단재모충정도상억제주대극적전하분리;모판제충류대우주대극전자.공혈대적분리여복합과정,이급아대극무복사약천인기적정격진동균유현저적영향.결과증실료양품표면광성여순태광복현상지간존재명현적능량호보관계.
Transient photovoltaic and surface photoacoustic techniques were used to investigate the separation and recombination processes of photogenerated charge carriers and the mechanism of energy conversion for mesoporous La-doped nano-TiO_2. Results indicate that two defect states with different photovoltage characteristics have a short diffusion distance and a fast recombination velocity for the electron hole pair; and that doped lanthanum increases the contribution of bulk defects to the photovoltaic effect, but inhibits the main bandgap charge separation to a certain extent. Additionally, we show that both the mechanism of separation and recombination of the main bandgap electron hole pair and the intensity of the lattice vibration resulting from the non-radioactive transition are highly dependent on the type of template. These experimental results confirm that an obvious energy balance relationship exists between transient photovoltaics and surface photoacoustic phenomena.