Sub-50 picosecond to microsecond carrier transport dynamics in pentacene thin films
| Autor: | Apparao M. Rao, Pan Adhikari, Ying Shi, Kanishka Kobbekaduwa, Nawal Al Abass, Jian He, Jianbing Zhang, Jianbo Gao |
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| Rok vydání: | 2018 |
| Předmět: |
Photocurrent
Materials science Physics and Astronomy (miscellaneous) Photoconductivity 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Variable-range hopping Molecular physics Pentacene chemistry.chemical_compound Microsecond chemistry Picosecond 0103 physical sciences Thin film 010306 general physics 0210 nano-technology Excitation |
| Zdroj: | Applied Physics Letters. 113:183509 |
| ISSN: | 1077-3118 0003-6951 |
| Popis: | Carrier transport dynamics from sub-50 ps to ∼μs over five temporal decades in pentacene films was studied by transient photoconductivity. The behavior of the temperature independent photocurrent peak suggests that the photogenerated carriers exhibit pre-trapping transport in extended states upon pulsed laser excitation. From 300 ps to ∼30 ns, the carriers thermalize and fall into shallow band tail states, and multiple-trapping and release transport dominates. From ∼30 ns to ∼μs, the weak temperature dependence of power-law photocurrent decay and the linear relation of logarithmic photocurrent with T−1/4 suggest a variable range hopping transport in deep trap states. |
| Databáze: | OpenAIRE |
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