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Review on thermoelectrical properties of selected imines in neat and multicomponent layers towards organic opto-electronics and photovoltaics

Bogdanowicz Krzysztof Artur, Iwan Agnieszka

Opto-Electronics Review

2021

Vol. 29, No. 4

201--212

The present review is mainly focused on the extended analysis of the results obtained from coupled measurement techniques of a thermal imaging camera and chronoamperometry for imines in undoped and doped states. This coupled technique allows to identify the current-voltage characteristics of thin films based on imine, as well as to assess layer defects in thermal images. Additional analysis of results provides further information regarding sample parameters, such as resistance, conductivity, thermal resistance, and Joule power heat correlated with increasing temperature. As can be concluded from this review, it is possible not only to study material properties at the supramolecular level, but also to tune macroscopic properties of -conjugated systems. A detailed study of the structure-thermoelectrical properties in a series of eight unsymmetrical and symmetrical imines for the field of optoelectronics and photovoltaics has been undertaken. Apart from this molecular engineering, the imines properties were also tuned by supramolecular engineering via protonation with camphorsulfonic acid and by creation of bulk-heterojunction compositions based on poly(4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl-alt-3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophene-4,6-diyl) and/or [6,6]-phenyl-C71-butyric acid methyl ester, poly(3,4-ethylenedioxythiophene) towards the analysed donor or acceptor ability of imines in the active layer. The use of coupled measurement techniques of a thermal imaging camera and chronoamperometry allows obtaining comprehensive data on thermoelectric properties and defects indicating possible molecule rearrangement within the layer.

Badanie wpływu rodzaju warstwy transportującej dziury na parametry elektryczne polimerowych ogniw słonecznych na bazie PTB7:PC71BM

Iwan A., Boharewicz B., Hreniak A., Tazbir I.

Przegląd Elektrotechniczny

2016

R. 92, nr 9

20--23

W artykule omówiono wpływ rodzaju warstwy transportującej dziury (HTL) na parametry elektryczne polimerowych ogniw fotowoltaicznych. Jako warstwę HTL zastosowano otrzymany metodą zol-żel tlenek molibdenu (MoOx) oraz PEDOT:PSS. Warstwę aktywną w ogniwie stanowiła mieszanina donorowo-akceptorowa na bazie PTB7 i PC71BM. Zbadano stabilność skonstruowanych polimerowych ogniw fotowoltaicznych w atmosferze powietrza po 8 dniach stwierdzając, iż ogniwa z warstwą MoOx wykazują lepszą stabilność niż ogniwa z warstwą PEDOT:PSS. Aczkolwiek, najwyższą wartość sprawności fotowoltaicznej określono na poziomie 5,1% dla polimerowego ogniwa fotowoltaicznego z warstwą PEDOT:PSS. W pracy przedstawiono wyniki pomiarów absorpcyjnych w zakresie UV-Vis, impedancji w postaci charakterystyk Nyquista oraz oszacowano ruchliwość nośników ładunków dla skonstruowanych ogniw.

The main goal of this paper was investigation influence of kind of hole transporting layer (HTL) on the electrical properties of constructed polymer solar cells. As HTL MoOx obtained by sol-gel method and PEDOT:PSS was applied. The polymer solar cells devices were fabricated by spin coating the blend solution of poly({4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl}{3-fluoro-2-[(2- ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl} (PTB7) as donor and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) as acceptor. Air stability of devices after 8th days were analyzed taking into consideration kind of HTL. Device with MoOx exhibited better stability than solar cell with PEDOT:PSS. However, the highest value of the power conversion efficiency reaches the level of 5.10% for the polymer solar cell with PEDOT:PSS layer. Additionally, Nyquist plots of constructed devices along with charge mobility and optical properties of PTB7 and their mixture with PC71BM were presented.