【摘要】 深入理解有机半导体中的光物理过程对于有机太阳能电池的设计和制备非常重要,酞菁铜是有机太阳能电池中非常典型的电子给体,本文通过改变酞菁铜的分子堆积方式延长了三重态激子的寿命.酞菁铜薄膜中激发态的衰退过程主要由三重态-三重态湮灭机制主导,超快瞬态吸收光谱的测试结果说明一维的激子扩散碰撞湮灭是最主要的激子湮灭机制,其衰退过程的湮灭速率常数满足γ∝t^-1/2.本文确定“站立”堆积和“平躺”堆积的酞菁铜薄膜中激子湮灭速率常数分别为（2.87±0.02）×10^-20cm³·s^-1/2和（1.42±0.02）×10^-20cm³·s^-1/2,“平躺”堆积的酞菁铜薄膜具有更高的光吸收系数和更长的激子寿命,这对有机太阳能电池是有益的.更多还原

【Abstract】 Photophysical processes occurring within organic semiconductors is important for designing and fabricating organic solar cells. Copper phthalocyanine（CuPc） is a typical electron acceptor. In this work, the triplet exciton lifetime is prolonged by altering the molecular stacking pattern of the CuPc film. For CuPc thin films, the excited state decays are mainly determined by the triplet-triplet annihilation process. The ultrafast transient absorption measurements indicate that the primary annihilation mechanism is one-dimensional exciton diffusion collision destruction. The decay kinetics show a clearly time-dependent annihilation rate constant with γ∝t^-1/2. Annihilation rate constants are determined to be γ₀=（2.87±0.02）×10^-20 cm³·s^-1/2 and（1.42±0.02）×10^-20cm³·s^-1/2 for upright and lyingdown configurations, respectively. Compared to the CuPc thin film with an upright configuration, the thin film with a lying-down configuration shows longer exciton lifetime and higher absorbance, which are beneficial to organic solar cells. The results in this work have important implications on the design and mechanistic understanding of organic optoelectronic devices.更多还原