Effects of post-deposited treatment on (CU, ZN) phthalocyanine/perylene composite light-harvesting layers
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POTLOG, Tamara, FURTUNĂ, Vadim, ROBU, Stephan V., DRAGALINA, Galina. Effects of post-deposited treatment on (CU, ZN) phthalocyanine/perylene composite light-harvesting layers. In: Ecological and environmental chemistry : - 2017, Ed. 6, 2-3 martie 2017, Chișinău. Chisinau, Republic of Moldova: Academy of Sciences of Moldova, 2017, Ediția 6, pp. 194-195.
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Ecological and environmental chemistry
Ediția 6, 2017
Conferința "Ecological and environmental chemistry 2017"
6, Chișinău, Moldova, 2-3 martie 2017

Effects of post-deposited treatment on (CU, ZN) phthalocyanine/perylene composite light-harvesting layers


Pag. 194-195

Potlog Tamara, Furtună Vadim, Robu Stephan V., Dragalina Galina
 
Moldova State University
 
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Disponibil în IBN: 18 martie 2019


Rezumat

The new world-record for an OPV multi-junction cell, which combines three different absorbers, each dedicated to efficiently converting green, red or near-infrared light to electricity reached a record conversion efficiency of 13.2% [1]. In this context, metallophthalocyanines (MPc) appear as excellent candidates for incorporation in photovoltaic systems, as they present intense absorption in the UV/blue and the red/near IR region of the solar spectrum. Perylene-3,4,9,10-tetracarboxylic acid diimide derivatives, also known as perylene diimides, or PDIs, are colorants that have been extensively studied as industrial dyes and pigments. Since pure Pc and perylene are insoluble in conventional solvents, close space sublimation method was used for the fabrication of thin films and solar cells based on them. In this work, we will present (Cu, Zn) Pc/perylene two-layer films and solar cells based on them. The investigation of the surface morphology of the (Cu, Zn)Pc and (Cu, Zn)Pc/perylene films after deposition and annealing at different temperatures in hydrogen atmosphere suggests, that the mixed layer of two pigments after annealing in hydrogen atmosphere at 200oC for 30 min, improves the structure in both cases. This mixed layer may act as an efficient carrier photogeneration layer. The XRD analysis of the CuPc as deposited thin films corresponds to the orthorhombic metastable α-phase [2]. Structure of the perylene are monoclinic with four molecules in a unit cell of dimensions a=11.27 A, b=10.82 A, c=10.26 A, b=100.55o and space group P21/a [3]. XRD analysis indicates the formation (Cu, Zn)Pc/Perylene composite thin films and the improving of the structure after heat treatment at 200oC in hydrogen atmosphere. Two-layered organic solar cells with of n-type perylene and p-type metallophthalocyanine (Cu, Zn)Pc deposited consecutive by close space sublimation method were fabricated on glass substrate covered with ITO. In this type of cell, the CuPc or ZnPc was used to absorb visible light and transport holes to the ITO electrode following exciton dissociation at the interface. The perylene was used to accept electrons from the (Cu, Zn)Pc and transport them to the aluminum top electrode. Investigation of the current-voltage characteristics at 100 mW/cm2 illumination, 300 K indicates that the photovoltaic parameters depend on the thickness of the (Cu, Zn)Pc active layer. The (Cu, Zn)Pc/Perylene layer improves short-circuit current density of the devices due to the increasing number of electrons and holes transferred by intermolecular interaction and efficient separation of excitons by formed internal electric field. The increase of perylene layer thicknesses in the bilayer photovoltaic device deteriorates photovoltaic parameters, while the increase of (Cu,Zn)Pc thickness leads to increase of the open circuit voltage up to 0.7 V. All of the solar cells gave limited performance and the efficiency of these devices are primarily limited by the current density (Jsc) and fill factor (FF), which is function dependent on the shunt/series resistances. The open circuit voltage and the efficiency of ITO/PEDOT: PSS/ZnPc/Perylene/Al devices reached a values of about 0.8 V and 0.6 %, respectively.