On the electrical and photo-electrical behavior of the photovoltaic cells based on polymeric and chlorophyll-a thin films

Proceedings of the Romanian Academy Series A-Mathematics Physics Technical Sciences Information Science

B. BITA¹ 

关键词: P3HT;    PCBM;    Chl-a;    organic photovoltaic cell.;   

DOI  :  

学科分类：计算机科学（综合）

来源: Editura Academiei Romane

【 摘 要 】

Photovoltaic cells based on conductive polymers, such as poly(3-hexylthiophene-2.5-diyl)(P3HT) and [6,6]-phenyl C61 butyric acid methyl ester (PC61BM), and chlorophyll-a (Chl-a) werefabricated and characterized, in ambient atmosphere. The architecture of prepared samples has beencompleted by deposition of buffer layers facilitating the charge carriers’ collection to electrodes. Toimprove the holes collection, poly(3.4-ethylenedioxythiophene)-poly(stryrenesulfonate) (PEDOT:PSS) andChl-a were used, and lithium fluoride (LiF) for the electrons’ collection, respectively. Both, the activelayer and the holes selective layer (HSL) were customized as P3HT:PC61BM + Chl-a (1:1:1), andPEDOT:PSS + Chl-a (4:1) or the bi-layer structure Chl-a/PEDOT:PSS. Indium thin oxide (ITO) waspreferred as anode, while aluminum as back electrode. The obtained devices were electrical andphoto-electrical characterized, and their performances were discussed in terms ofITO/PEDOT:PSS/P3HT:PC61BM (1:1)/LiF/Al conventional structures. We demonstrated that acustomized PEDOT:PSS + Chl-a (4:1) HSL improved with more than 50% the external quantumefficiency of fabricated photovoltaic cells, compared with the results of conventional structures.Modest values of open circuit voltage and fill factor were calculated in the case of Chl-a/PEDOT:PSSHSL based photovoltaic cells, most likely due to a non-optimized interface between Chl-a andPEDOT:PSS which lead to the creation of a great number of defects acting as recombination centers.

【 授权许可】

Unknown