Optical properties of PTCDI thin films studied by contactless electroreflectance

Wei-Juann Chen; Ming-Hau Chang; Chung-Chih Chang; Min-Chih Tsai; Horng-Long Cheng; Wei-Yang Chou

doi:10.1117/12.893479

7 September 2011 Optical properties of PTCDI thin films studied by contactless electroreflectance

Wei-Juann Chen, Ming-Hau Chang, Chung-Chih Chang, Min-Chih Tsai, Horng-Long Cheng, Wei-Yang Chou

Proceedings Volume 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V; 81201E (2011) https://doi.org/10.1117/12.893479
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

Room-temperature contactless electroreflectance (CER) was used to investigate the optical properties of a N,N'-didecylperylene-3,4,9,10-tetracarboxylic diimide (PTCDI-C₁₀H₂₁) thin-film sandwiched between indium tin oxide and aluminum electrodes (Al/PTCDI/ITO/glass substrate) under vacuum conditions. The electromodulated optical responses of the Al/PTCDI/ITO/glass structures were characterized by various alternating current biases. The optical transitions of PTCDI were perturbed by energy shifts of electronic states due to the Stark effect induced by the modulated electric field. The modulated CER spectrum of PTCDI is strongly enhanced by performing first derivatives on the absorption spectrum of PTCDI. The CER spectrum involves fundamental transitions, doping states, and Davydov splitting. Moreover, the intensity of the field-induced transition peak of PTCDI increases with increasing CER modulation voltage. The transition energies between the lowest unoccupied molecular orbital and highest occupied molecular orbital of the Al/PTCDI/ITO system is obtained from the peak positions in the CER spectrum.

Citation Download Citation

Wei-Juann Chen, Ming-Hau Chang, Chung-Chih Chang, Min-Chih Tsai, Horng-Long Cheng, and Wei-Yang Chou "Optical properties of PTCDI thin films studied by contactless electroreflectance", Proc. SPIE 8120, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V, 81201E (7 September 2011); https://doi.org/10.1117/12.893479

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