Search results for " Organic solar cells"
showing 4 items of 4 documents
Donor/acceptor heterojunction organic solar cells
2017
Organic solar cells (OSCs) have made very good improvements in recent years, reaching power conversion efficiencies above 10% [1]. This have been achieved through chemical synthesis of new organic materials with improved properties and also by new and more or less complex structures such as donor/acceptor (D/A) or bulk heterojunction OSCs. Here we report the results of initial development of OSCs based on the simple D/A heterojunction [2]. Copper phtalocyanine (CuPc) is used as donor organic material, whereas perylenetetracarboxylic dianhydride (PTCDA) and fullerene (C60) as acceptor organic materials. Moreover bathocuproine (BCP) is used as exciton blocking layer. Devices are fabricated by…
Photovoltaic characterization of organic solar cells
2018
In recent years organic solar cells (SCs) have reached power conversion efficiencies above 10% [1]. Organic photovoltaics is indeed an intensively pursued research field because it promises high efficiency and low cost SCs. Organic materials have unique and useful optoelectronic properties, their chemical synthesis can be cheap and easy, and can be deposited in the form of thin films even on flexible plastic substrates by simple deposition techniques such as spinning, ink-jet printing and high vacuum thermal evaporation. Here we report results of the photovoltaic characterization of organic SCs having the donor (D)/acceptor (A) heterojunction structure [2]. The SCs, fabricated by vacuum the…
Enhanced efficiency in plastic planar heterojunction solar cells by AuNPs positioned at donor-acceptor interfaces
2018
A new class of copolymers containing oligothiophene moieties with different length and fullerene units have been designed and prepared by an easy and inexpensive one-step synthetic approach. The incorporation of small quantities of these copolymers into bulk heterojunction (BHJ) solar cells with donor regioregular polythiophene (P3HT) and acceptor fullerene derivate (PCBM) results in a good control of the phase separation process without further affecting the BHJ optoelectronic properties. Indeed, these copolymers allow modulating under thermal annealing the growth of domains whose size depends on the length of the copolymer repetitive units. Domain size on the same length scale of the P3HT…