Lee, Horim Hwang, Daesub Jo, Seong Mu Kim, Dongho Seo, Yongsok Kim, Dong Young 2024-01-20T14:34:01Z 2024-01-20T14:34:01Z 2021-09-05 2012-06 1944-8244 https://pubs.kist.re.kr/handle/201004/129208 Hierarchically structured TiO2 (HS-TiO2) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO2 nanocrystalline powder in order to fabricate flexible DSSCs under low-temperature (<150 degrees C) conditions. The cell efficiency increased when using flexible ITO-PEN substrates post-treated by either a mechanical compression treatment or a chemical sintering treatment using titanium n-tetrabutoxide (TTB). The mechanical compression treatment reduced the surface area and porosity of the HS-TiO2; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO2 and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO2 cells. The electron diffusion coefficients of the as-pressed HS-TiO2 improved upon compression treatment, whereas the recombination lifetimes remained unchanged. An additional chemical sintering post-treatment involving TTB was tested for its effects on DSSC efficiency. The freshly coated TiO2 submitted to TTB hydrolysis in water at 100 degrees C yielded an anatase phase. TTB treatment of the HS-TiO2 cell after compression treatment yielded faster electron diffusion, providing an efficiency of 5.57% under 100 mW cm(-2), AM 1.5 global illumination. English American Chemical Society Low-Temperature Fabrication of TiO2 Electrodes for Flexible Dye-Sensitized Solar Cells Using an Electrospray Process Article 10.1021/am3007164 1 ACS Applied Materials & Interfaces, v.4, no.6, pp.3308 - 3315 ACS Applied Materials & Interfaces 4 6 3308 3315 N scie scopus 000305716900067 2-s2.0-84863228755 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article ENERGY-CONVERSION THIN-FILM NANOPARTICLES PERFORMANCE EFFICIENCY electrospray hierarchical structured TiO2 flexible dye sensitized solar cells low temperature process compression treatment chemical sintering