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Nguyen Tam Nguyen Truong,박진호,Matthew Lowell Monroe,Umme Farva,Timothy James Anderson 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.7
Bulk hetero-junction solar cells with CdSe nanoparticles-P_3HT (poly 3-hexyl thiophene) composite active layer were fabricated, and the control of morphological feature of the nanoparticle-polymer composite thin films was investigated. A binary solvent composed of a primary solvent with intermediate polarity and a secondary solvent with high polarity was found to be effective in controlling the dispersion of the CdSe nanocrystals in the P_3HT matrix, and the modification of the nanocrystal surface by liquid-liquid extraction process was found to be effective in achieving the desired composite film morphology. Surface roughness of the active layer was optimized for various loadings of CdSe nanoparticles and could be reproducibly controlled to less than 10 nm.
Hyungmin Lee,Dong-seob Jeong,Taehong Mun,Babu Pejjai,Vasudeva Reddy Minnam Reddy,Timothy James Anderson,박진호 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.8
CuInSe2 (CISe) thin films were grown on Mo-coated glass substrates by spray coating technique using nanocrystalline ink. The ink was prepared by dissolving binary CuSe and In2Se3 nanoparticles in iso-butanol. The grown films were subsequently annealed in vacuum and selenium atmosphere, and examined by various characterization techniques. The vacuum-annealed films showed the CuSe binary phase along with the CuInSe2 phase, whereas the selenized films showed a single phase CuInSe2. The elemental analysis of the selenized film exhibited near stoichiometry, and the photoluminescence peak was observed in the region of band-to-band transitions (0.97 eV), which indicated the good structural quality of the selenized films. The developed method opens a new prospect for the finetuning of CISe composition by pre-adjusting the composition of each element in the binary to best fit of CISe in the photovoltaic devices.