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Carrier Dynamics of Efficient Triplet Harvesting in AgBiS2/Pentacene Singlet Fission Solar Cells
Advanced Science ( IF 14.3 ) Pub Date : 2023-03-20 , DOI: 10.1002/advs.202300177
Pai Geng 1, 2, 3 , Dezhang Chen 1 , Sunil B Shivarudraiah 1 , Xihan Chen 2, 4 , Liang Guo 2, 3 , Jonathan E Halpert 1, 5, 6
Affiliation  

Singlet fission is a process by which an organic semiconductor is able to generate two triplet excitons from a single photon. If charges from the triplets can be successfully harvested without heavy losses in energy, then this process can enable a single-junction solar cell to surpass the Shockley–Queisser limit. While singlet fission processes are commonly observed in several materials, harvesting the resulting triplets is difficult and has been demonstrated with only a few transport materials. Here, transient absorption spectroscopy is used to investigate singlet fission and carrier transfer processes at the AgBiS2/pentacene (AgBiS2/Pc) heterojunction. The successful transfer of triplets from pentacene to AgBiS2 and the transfer of holes from AgBiS2 to pentacene is observed. Further singlet fission in pentacene by modifying the crystallinity of the pentacene layer and have fabricated the first singlet fission AgBiS2/Pc solar cell is enhanced. Singlet fission devices exhibit higher external quantum efficiency compared with the control devices, and thus demonstrating the significant contribution of charges from the singlet fission process.

中文翻译:

AgBiS2/并五苯单线态裂变太阳能电池中高效三线态捕获的载流子动力学

单重态裂变是有机半导体能够从单个光子产生两个三重态激子的过程。如果可以在不损失大量能量的情况下成功收集三胞胎的电荷,那么这个过程可以使单结太阳能电池超越肖克利-奎塞尔极限。虽然在几种材料中通常观察到单线态裂变过程,但收获产生的三线态是困难的,并且仅用少数传输材料进行了证明。此处,瞬态吸收光谱用于研究 AgBiS 2 /并五苯 (AgBiS 2 /Pc) 异质结处的单线态裂变和载流子转移过程。三联体从并五苯到 AgBiS 2的成功转移以及空穴从 AgBiS 的转移观察到2至并五苯。通过改变并五苯层的结晶度进一步增强并五苯的单线态裂变,并制造出第一个单线态裂变AgBiS 2 /Pc太阳能电池。与控制装置相比,单线态裂变装置表现出更高的外部量子效率,从而证明了单线态裂变过程中电荷的重要贡献。
更新日期:2023-03-20
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