TY - JOUR
T1 - Investigation of TiO2 surface modification with [6,6]-phenyl-C61-butyric acid for titania/polymer hybrid solar cells
AU - Ma, Teng
AU - Zhang, Jinyu
AU - Kojima, Ryota
AU - Tadaki, Daisuke
AU - Kimura, Yasuo
AU - Niwano, Michio
PY - 2013/11
Y1 - 2013/11
N2 - We have investigated modification of TiO2 surfaces with [6,6]-phenyl-C61-butyric acid (PCBA) used for fabrication of TiO 2/poly(3-hexylthiophene-2,5-diyl) (P3HT) hybrid solar cells. The surface modification process was monitored using in-situ infrared absorption spectroscopy in the multiple-internal reflection geometry (MIR-IRAS). IR data showed that longer exposure of TiO2 surfaces to an organic solution of PCBA leads to undesirable formation of a physisorbed PCBA overlayer that cannot be removed by rinsing the surface in pure solvent. We found that ultrasonic cleaning of the TiO2 surface removed most of the physisorbed PCBA molecules. Modification of TiO2 surfaces with PCBA molecules drastically increased the short circuit current of TiO 2/P3HT-based hybrid solar cells, which is ascribed to improved charge separation efficiency at the TiO2/P3HT interface. The physisorbed PCBA molecules decreased the open circuit voltage and the fill factor. We demonstrated that the power conversion efficiency is improved by ultrasonic cleaning following PCBA deposition.
AB - We have investigated modification of TiO2 surfaces with [6,6]-phenyl-C61-butyric acid (PCBA) used for fabrication of TiO 2/poly(3-hexylthiophene-2,5-diyl) (P3HT) hybrid solar cells. The surface modification process was monitored using in-situ infrared absorption spectroscopy in the multiple-internal reflection geometry (MIR-IRAS). IR data showed that longer exposure of TiO2 surfaces to an organic solution of PCBA leads to undesirable formation of a physisorbed PCBA overlayer that cannot be removed by rinsing the surface in pure solvent. We found that ultrasonic cleaning of the TiO2 surface removed most of the physisorbed PCBA molecules. Modification of TiO2 surfaces with PCBA molecules drastically increased the short circuit current of TiO 2/P3HT-based hybrid solar cells, which is ascribed to improved charge separation efficiency at the TiO2/P3HT interface. The physisorbed PCBA molecules decreased the open circuit voltage and the fill factor. We demonstrated that the power conversion efficiency is improved by ultrasonic cleaning following PCBA deposition.
UR - http://www.scopus.com/inward/record.url?scp=84889032077&partnerID=8YFLogxK
U2 - 10.7567/JJAP.52.112301
DO - 10.7567/JJAP.52.112301
M3 - Article
AN - SCOPUS:84889032077
SN - 0021-4922
VL - 52
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
IS - 11 PART 1
M1 - 112301
ER -