Charge Carrier Transport Properties in PBDTTPD Organic Solar Cell Structure
Andrius Aukštuolis a, Nerijus Nekrašas a, Kristijonas Genevičius a, Mihaela Girtan b, Giedrius Juška a
a Institute of Chemical Physics Vilnius University, Lithuania, Saule ̇tekio al.3, Vilnius, Lithuania
b Photonics Laboratory, (LPhiA) E.A. 4464, SFR Matrix, Université d’Angers, Faculté des Sciences, 2 Bd Lavoisier, 49000 Angers, France
International Conference on Hybrid and Organic Photovoltaics
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Online, Spain, 2020 May 26th - 29th
Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson
Poster, Andrius Aukštuolis, 046
Publication date: 22nd May 2020
ePoster: 

Organic semiconductors are getting more popularity in terms of using them in electronic devices and in creating new materials and inspecting them. However, organic materials carries few features which are considered as drawbacks, but they can be as advantages in other applications. For example, organic materials are sensitive to atmosphere conditions due to degradation to humidity and oxygen, mobility of charge carriers is low. However due to their usually rather amorphous state they can be implemented in applications where flexibility of a device is necessary. Although organic layers are usually amorphous, but slight difference in manufacturing conditions can cause a significant change in device performance as morphology of organic material is closely tied with the characteristics.

There are numerous studies of mixed organic materials (bulk heterojunctions) in solar cell structure devices. These studies bring useful information about optimal parameters of the device or optimal ratio of used materials. There only few studies where devices with a single PBDTTPD ((Poly[(5,6-dihydro-5-octyl-4,6-dioxo-4H-thieno[3,4-c]pyrrole-1,3-diyl)[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl]]) layer were inspected. In single layered devices only one material is working as an active layer and more information about it can be gathered. Morphology of that material can be easily tied with the parameters like mobility, current, recombination, efficiency. This information is crucial for better understanding how material works and how it can be used in other application and with other materials as well.

In this work we were analyzing hole transport properties in PBDTTPD layer employed in solar cell structure. By using photo-CELIV technique [1] we showed not only the possibilities of the technique for investigating organic layers, but measured hole mobility in the layer, recombination coefficient of the layer and Langevin’s recombination prefactor [2].

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