Abstract
The authors investigate the effects of metal work functions on charge transport characteristics in P3HT:PCBM bulk heterojunction under illumination by evaluating the temperature dependence of current-voltage characteristics. Schottky thermal emission current plays a dominant role on charge transport in the devices with Au or Al alloys used as electrodes. Whereas, a combined bulk limited conduction mechanism corresponding to three-dimensional variable-range hopping model and space charge limited current (SCLC) with an exponential distribution of traps (filled and unfilled) occurs in the device with Al used as electrode. And a shift to LUMO state of PCBM for trap density distribution is observed due to temperature dependence of Fermi level in PCBM material.
Original language | English |
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Pages (from-to) | 64-68 |
Number of pages | 5 |
Journal | Chemical Physics Letters |
Volume | 529 |
DOIs | |
State | Published - 2012/03/09 |
ASJC Scopus subject areas
- General Physics and Astronomy
- Physical and Theoretical Chemistry