Heterojunction photovoltaics solar cells

Nowadays the best performing organic photovoltaic cell is represented by a bulk heterojunction (BHJ) solar cell based on the polymer poly(3-hexylthiophene) (P3HT) and the fullerene derivative [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM), with reproducible efficiencies approaching 5% [262,263], However, a serious drawback for the preparation of efficient organic photovoltaic cells is represented by the low optical absorbance in the red/near-infrared region of the lightharvesting component(s), as well as their low extinction coefflcient(s). [Pg.34]

Innovations in materials science and technology have provided promising strategies to realize a high photovoltaic performance. Besides the intrinsic properties of photoactive polymer materials, morphology is also critical in bulk heterojunction polymer solar cells. [Pg.155]

K. Lee, J. Y. Kim, and A. J. Heeger. 2008. Titanium oxide films as multifunctional components in bulk heterojunction "plastic" solar cells. In Organic Photovoltaics Materials, Device Physics, and Manufacturing Technologies, ed. C. Brabec, V. Dyakonov, and U. Scherf. Weinheim WUey-VCH. [Pg.254]

Table 1 Photovoltaic performance parameters of bulk heterojunction organic solar cell with NPs embedded between interfacing layers. ...

In a bulk-heterojunction photovoltaic cell with methanofullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) as an electron acceptor, alternating copolymer 19 (Fig. 9), derived from 2,7-fluorene and 2,5-dithienylsilole, can show impressive performance as the electron donor.31 In a device configuration of ITO/PEDOT/active layer/Ba/Al, the dark current density—bias curve shows a small leakage current, suggesting a continuous, pinhole-free active layer in the device. Under illumination of an AM 1.5 solar simulator at 100 mW/cm2, a high short-circuit current of 5.4 mA/cm2, an open-circuit voltage of 0.7 V, and a fill factor of 31.5% are achieved. The calculated energy conversion efficiency is 2.01%. [Pg.199]

A series of ruthenium(II) phthalocyanines with one or two pyridyl dendritic olig-othiophene axial substituent(s) have also been reported (compounds 50 and 51) [50], The dendritic ligands absorb in the region from 380 to 550 nm, which complements the absorptions of the phthalocyanine core. This combination results in better light harvesting property and enhancement in efficiency of the corresponding solar cells. The solution-processed photovoltaic devices made with these compounds and fullerene acceptor give efficiencies of up to 1.6%. These represent the most efficient phthalocyanine-based bulk heterojunction solar cells reported so far. [Pg.184]

The previous section gave an overview of the transport and junction properties of conjugated materials regarding their importance for photovoltaic devices. In this chapter, the bulk heterojunction device itself will be in the spotlight. Device properties will be discussed and evaluated as for classical inorganic solar cells, concentrating on the short-circuit current /sc, the open-circuit voltage Foc, the fill factor FF, and the spectral sensitivity. [Pg.185]

This work summarizes the physics of a special area of photovoltaic energy conversion, i.e., polymer-based, bulk heterojunction solar cells. With about... [Pg.242]

Heutz S., Sullivan P., Sanderson B., Schultes S. M. and Jones T. S. (2004), Influence of molecular architecture and intermixing on the photovoltaic, morphological, and spectroscopic properties of CuPc-Ceo heterojunctions , Solar Energy Mat. Solar Cells 83, 229-245. [Pg.493]

Recently, the Konarka group achieved power conversion efficiencies of 5.2% for a low band gap polymer-fuUerene bulk heterojunction solar cell, as confirmed by NREL (National Renewable Energy Laboratory, USA). This encourages the practical use of this concept for low cost, large area production of photovoltaic devices. [Pg.41]

Hoppe H, Egbe DAM, Muhlbacher D, Sariciftci NS (2004) Photovoltaic action of conjugated polymer/fuUerene bulk heterojunction solar cells using novel PPE-PPV copolymers. J Mater Chem 14 3461... [Pg.73]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...