Abstract
The time-of-flight method has been used to study the effect of P3HT molecular weight (Mn = 13-121 kDa) on charge mobility in pristine and PCBM blend films using highly regioregular P3HT. Hole mobility was observed to remain constant at 10-4cm2V-1 s-1 as molecular weight was increased from 13-18 kDa, but then decreased by one order of magnitude as molecular weight was further increased from 34-121 kDa. The decrease in charge mobility observed in blend films is accompanied by a change in surface morphology, and leads to a decrease in the performance of photovoltaic devices made from these blend films.
Original language | English (US) |
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Pages (from-to) | 2373-2380 |
Number of pages | 8 |
Journal | Advanced Functional Materials |
Volume | 18 |
Issue number | 16 |
DOIs | |
State | Published - Aug 22 2008 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Materials Science
- Condensed Matter Physics