论文标题
四烯多态性的变化促进了单线裂变敏感的硅太阳能电池中的三重态转移
Change in Tetracene Polymorphism Facilitates Triplet Transfer in Singlet Fission-Sensitized Silicon Solar Cells
论文作者
论文摘要
四烯中的单线裂变会产生每个吸收光子的两个三重激烈激子。如果可以有效地转移到硅（SI）中，则可以从Si带隙上方的光子产生其他光电流。这可以减轻热损失并提高常规SI太阳能电池的效率。在这里，我们表明，由于空气暴露而沉积在SI上的四烯的多态性变化，促进了三烯烯转移到Si中。磁场依赖性光电流测量结果证实了三重态激子有助于光电流。四烯延迟的光致发光的衰减用于确定215 ns的三重态转移时间和三胞胎转移到Si的最大产量〜50％。我们的研究表明，对沉积过程中四烯的形态的控制对于进一步提高三重态转移产量至关重要。
Singlet fission in tetracene generates two triplet excitons per absorbed photon. If these triplet excitons can be effectively transferred into silicon (Si) then additional photocurrent can be generated from photons above the bandgap of Si. This could alleviate the thermalization loss and increase the efficiency of conventional Si solar cells. Here we show that a change in the polymorphism of tetracene deposited on Si due to air exposure, facilitates triplet transfer from tetracene into Si. Magnetic field-dependent photocurrent measurements confirm that triplet excitons contribute to the photocurrent. The decay of tetracene delayed photoluminescence was used to determine a triplet transfer time of 215 ns and a maximum yield of triplet transfer into Si of ~50 %. Our study suggests that control over the morphology of tetracene during deposition will be of great importance to boost the triplet transfer yield further.
