Presentation Information
[2P45]Carbon nanotube coating on Mn-doped BiFeO3 thin film using a self-assembled monolayer for photovoltaic device application
*Yoshiki Kagobayashi1, Seiji Nakashima1, Shunjiro Fujii1, Ai I Osaka1, Hironori Fujisawa1 (1. Graduate School of Engineering, University of Hyogo)
BiFeO3 (BFO) thin films exhibit a bandgap of 2.5-2.8 eV and show a strong bulk photovoltaic effect (BPV), generating voltages up to 1700 times higher than conventional Si solar cells. However, due to the extremely thin ferroelectric layer, light absorption is limited. To address this, carbon nanotubes (CNTs), which have both metallic conductivity and light absorption capabilities, were introduced as electrodes. Since CNTs do not form uniformly by simple solution dropping process, a self-assembled monolayer (SAM) using 3-aminopropylethoxysilane (APTES) was employed to enhance coating uniformity and adhesion. Raman spectroscopy revealed that CNTs more readily coat BFO surfaces with downward polarization, showing a clear G-band peak at approximately 1590 cm-1, while broad peak was observed for upward polarization. This is attributed to surface charge effects influencing SAM formation. Detailed photovoltaic properties will be presented at the conference.