| AVS 64th International Symposium & Exhibition | |
| Electronic Materials and Photonics Division | Wednesday Sessions |
| Session EM-WeM |
| Session: | Charge Transport in Disordered Materials |
| Presenter: | Eunah Kim, Ewha Womans University, Republic of Korea |
| Authors: | E. Kim, Ewha Womans University, Republic of Korea S. Kwon, Ewha Womans University, Republic of Korea D.H. Kim, Ewha Womans University, Republic of Korea H.-H. Park, Korea Advanced Nano Fab Center, Republic of Korea J. Kim, Incheon National University, Republic of Korea D.-W. Kim, Ewha Womans University, Republic of Korea |
| Correspondent: | Click to Email |
Organic-inorganic hybrid nanostructures have been proposed to improve the performance of organic photovoltaic devices. In this work, we investigated creation and transport behaviors of photo-generated carriers in P3HT-based hybrid nanostructures, such as P3HT-coated Si-nanopillar (NP) arrays and P3HT layers with embedded upconversion nanorods (UCNs). Optical resonance strongly concentrated incident light in the Si NPs, significantly increasing the number of photo-carriers near the NPs. The UCNs converted near-infrared (NIR) light to visible light . We studied spatial distribution of the surface photovoltage (SPV) in the P3HT/Si-NP and P3HT/UCN samples using Kevin probe force microscopy. The magnitude and sign of SPV are determined by the number of the photo-carriers and band profiles near the sample surface [1-3]. Large SPV values appeared in the P3HT layers near the Si NPs under illumination of visible light and near the UCNs under illumination of NIR light in the P3HT/Si-NP and P3HT/UCN samples, respectively [3,4]. This suggested that the concentrated light in the NPs and photon upconversion in the UCNs increased the local density of photo-carriers. Our work shows that the scanning probe microscopy technique can visualize the creation and transport behaviors of photo-generated carriers in nanostructures.
1. E. Kim et al., Curr. Appl. Phys.16, 141 (2016).
2. M. Gwon et al., Sci. Rep.5, 16727 (2015).
3. E. Kim et al., Sci. Rep.6, 29472 (2016).
4. Y. Jang, E. Kim et al., J. Phys. Chem. Lett. 8, 364 (2017).