Polyazomethine as a component of solar cells-theoretical and optical study
PBN-AR
Instytucja
Wydział Fizyki (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN
0022-3697
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
186–193
Numer tomu
86
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Organic solar cells
Azomethine
PCBM
TD-DFT
Luminescence
Electrical properties
Streszczenia
Język
en
Treść
A recently synthesized 25Th-cardo polyazomethine (PAZ) and its photocurrent generating junction with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) have been examined as possible materials for construction of new-generation solar cells. Properties of a 25Th-cardo/PCBM system, where PAZ and PCBM act as donor and acceptor materials, respectively, have been studied theoretically by time-dependent density-functional theory (TD-DFT) and experimentally by means of optical absorption, photocurrent spectroscopy (PCS), and time-resolved luminescence (TRPL). Theoretical calculations show that highest occupied molecular orbital (HOMO) energy levels of PAZ and PCBM are almost equal (values of −6.01 and −5.98 eV were obtained with the B3LYP functional and the def2-TZVP orbital basis for PAZ and PCBM, respectively), what suggests a possibility of charge transfer in both directions for this system. The shape of the calculated absorption spectrum is in a qualitative agreement with the experiment. The PCS measurements of the new material show that the external quantum efficiency is the highest (about 0.3%) in the near UV range. The TRPL studies reveal a fast decay of a Langevin type (in picosecond range) of the PAZ-related photoluminescence, which accelerates in presence of PCBM, probably due to the charge transfer to PCBM. In addition, our measurements document a usually neglected process of the hole transfer from a donor to an acceptor. A leakage of holes from PAZ to PCBM is supported by a small energy difference of the HOMO energies, as predicted by theory.
Cechy publikacji
discipline:Chemia
discipline:Elektrotechnika
discipline:Fizyka
discipline:Inżynieria materiałowa
discipline:Chemistry
discipline:Electrical engineering
discipline:Physics
discipline:Materials science
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:626592
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