Organic optoelectronics

Principal Investigators:

  • Prof. Vidmantas Gulbinas 
  • Dr. Andrius Devižis 
  • dokt. Rokas Jasiūnas 
Organic materials have a number of attractive properties that can be used to develop the next generation of electronics and optoelectronic devices, such as organic light-emitting diodes and solar cells. In addition to relatively low-cost production technologies, these devices can be flexible, semi-transparent, large, colored, and flexibly integrated into buildings or furniture. However, they still can not compete with inorganic semiconductor devices for efficiency and long-term stability. Many processes in organic semiconductors are different than in inorganic ones. They are often more complex, strongly depend on the chemical structure and morphology of the material.  Our goals are to understand the basic electronic properties and photoelectronic processes in these materials, to find their relations with structure, to learn how to control them for improving the performance of the devices.

The main challenges to be addressed are:

  • Identification of the exciton dynamics, migration and relaxation mechanisms
  • Charge carrier generation in organic semiconductors at their interfaces and in solar cells
  • Charge carrier mobility, its dynamics, carrier drift and diffusion
  • Charge carrier recombination and extraction processes in organic solar cells

Major publications
  1. A. Devižis, A. Serbenta, K. Meerholz, D. Hertel, and V. Gulbinas, “Ultrafast Dynamics of Carrier Mobility in a Conjugated Polymer Probed at Molecular and Microscopic Length Scales”, Phys. Rev. Lett., 103, 027404, 2009.
  2. D. Amarasinghe Vithanage, A. Devižis, V. Abramavičius, Y. Infahsaeng, D. Abramavičius, R.C.I. MacKenzie, P.E. Keivanidis, A. Yartsev, D. Hertel, J. Nelson, V. Sundstrom, V. Gulbinas, “Visualizing charge separation in bulk heterojunction organic solar cells”, Nature Communications 4, 2334, 2013.
  3. A. Melianas, V. Pranculis, Y. Xia, N. Felekidis, O. Inganäs, V. Gulbinas, M. Kemerink,  “Charge Transport in Pure and Mixed Phases in Organic Solar Cells” Advanced Energy Materials, 7 (9), 160214, 2017.
  4. V. Abramavicius, V. Pranculis, A. Melianas, O. Inganäs, V. Gulbinas, D. Abramavicius, “Role of coherence and delocalization in photo-induced electron transfer at organic interfaces”, Scientific Reports 6, 32914, 2016.
  5. Jasiūnas, R., Melianas, A., Xia, Y., Felekidis, N., Gulbinas, V., Kemerink, M., “Dead Ends Limit Charge Carrier Extraction from All-Polymer Bulk Heterojunction Solar Cells”, Advanced Electronic Materials, 4 (8), art. no. 1800144, 2018.