| Title |
Study of carrier transport, trapping and optical nonlinearities in polymers promising for optoelectronic applications / |
| Translation of Title |
Krūvio pernašos ir pagavos bei optinių netiesiškumų tyrimas polimerinėse medžiagose, perspektyviose optoelektronikos taikymams. |
| Authors |
Pranaitis, Mindaugas |
| Full Text |
|
| Pages |
113 |
| Keywords [eng] |
Carrier transport ; trapping ; polymer ; DNA complex |
| Abstract [eng] |
The main goals of the thesis are advanced characterization by complementary optical and electrical methods of organic semiconductors and the complexes of DNA (deoxyribonucleic acid) designed with purposefully controllable properties for opto-, photo- and electrical applications in modern device engineering. It was demonstrated that the polymer photovoltaic device having an active layer with donor/transmitter/acceptor structure bearing polar molecules exhibits the improvement of the external quantum efficiency associated with the growth of the mobility and reduced potential barrier for charge injection or extraction from the electrodes. The impact of the trapping states and their energetical and spatial distribution on the charge transport properties of organic semiconductors was revealed by several different complementary methods. It was demonstrated that carrier trapping is effectively involved in the charge transport phenomena, depending on the exciting light spectral range and applied electrical field. The influence of the hybrid DNA, dyes and silica material complexes on the optical properties of bio-organic materials was proven. Later the new cationic surfactant with a high efficiency third order nonlinear optical properties was demonstrated, which extended the range of available solvents for DNA complex. |
| Type |
Doctoral thesis |
| Language |
English |
| Publication date |
2012 |
