Development of Inverted P3HT:TiO2 Bulk Heterojunction Hybrid Solar Cell Using (4,5-Diaza-9,9’-spirobifluorene) Functionalized Donor/Acceptor Conjugated Oligomer as Interface Modifier
Date Issued
2011
Date
2011
Author(s)
Ho, Yi-Chen
Abstract
Our research focuses on the improvement of power conversion efficiency (PCE) of poly (3-hexylthiophene) (P3HT)/TiO2 nanorods hybrid organic solar cell. We studied the effect of different surface ligands on the efficiency of P3HT/TiO2 nanorods hybrid solar cells.
Three conducting oligomeric surface modifiers made by coupling 4, 5–diaza–9, 9’-spiro bifluorene with diketo pyrrolopyrrole (PZFDPP), bithiazole (PZFBTZ), and thieny 1-2, 1, 2-benzothiadiazole (PZFTBT) were synthesized. They exhibit low energy gap of 1.2 eV, 1.6 eV, and 1.6 eV for PZFDPP, PZFBTZ, and PZFTBT respectively. They can form cascade bandgap between P3HT and TiO2 to facilitate the transport of charge carriers. PZFDPP modified TiO2 has the highest electron mobility of 1.8X10-4cm2/Vs as compared with 1.1X10-4cm2/Vs of unmodified TiO2.
The surface modified TiO2 was mixed with P3HT to fabricate invert solar cells. The PZFDPP modified TiO2 exhibits the best performance. Its power conversion efficiency was increased from 0.42% to 1.20% as compared with unmodified TiO2.
Subjects
Solar cell
Poly (3-hexylthiophene)
TiO2 nanorod
Surface modifier
Oligomer
Type
thesis
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