Dynamics of Photogenerated Polaron-Excitons in Organic Semiconductors

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• 作者：Luiz A. Ribeiro Junior ; ^{ribeirojr@fis.unb.br} ; Pedro H. Oliveira Neto ; Wiliam F. da Cunha ; Geraldo M. e Silva
• 关键词：SSH ; Photoexcitations ; Polaron-Excitons ; Polarons
• 刊名：Physics Procedia
• 出版年：2012
• 期刊代码：P128_18753892
• 类别：ph
• 出版时间：2012
• 卷：28
• 期：Complete
• 页码：112-116
• 文件大小：1352 K

摘要

In this work we performed numerical simulations of one 蟺-conjugated polymer chain subjected to photogeneration. Within the SSH model modi铿乪d to include the Brazoviskii-Kirova symmetry breaking term, we investigate the dynamics of photoexcitations to address the generation mechanism of polaron-excitons using the unrestricted Hartree-Fock approximation. It was obtained that after the photoexcitation the system relaxes spontaneously into a polaron-exciton in a transient state in a range of 200 fs. Our results also show that charged polarons are generated directly after this transient state.