Focusing on photovoltaic device working processes,as to design higher efficiency quantum dot photovoltaic device, charge transfer dynamics at interface in quantum dot films at different time scales are studied.The results of transient photocur-rent (Time of Flight/TOF)indicate charge transfer at interfaces between quantum dots and electrodes,then charge carriers re-combination occurs,the time scale for later is about 120 ns.Furthermore,by comparing single and two sizes quantum dot ploto-voltaic devices’TOF signals,we arrive at a conclusion that the contribution of interface charge transfer between different sizes quantum dots.In the end,time-resolved fluorescence spectrum is used to study interface charge transfer between quantum dots and acceptors,the results reveal that the processes occur at tens of ps.%为了更好地了解量子点光伏器件的工作过程，从而为设计高效量子点光伏器件提供依据，研究了 CdSe 耦合量子点薄膜在不同时间尺度的界面电荷转移动力学特性。通过瞬态光电流（TOF）研究了量子点与电极之间的界面电荷转移及随后发生的载流子复合过程，结果表明，后者的时间尺度约在120 ns 左右；然后对比单双层量子点光伏器件 TOF 信号，结果表明在双层量子点光伏器件中存在不同尺寸量子点之间的界面电荷转移过程；最后采用时间分辨荧光光谱手段研究了量子点与受体之间的界面电荷转移过程，结果表明该过程发生在几十 ps 的时间尺度。
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