MIM model

Fig. 5.1. Charge generation process in a single-layer conjugated polymer device under short-circuit conditions in the MIM model. VB valence band, CB conduction band, Eg bandgap, P+, P positive and negative polarons...

Mihailetchi [134] investigated the open circuit voltage of the bulk heterojunction organic solar cells based on methanol-fullerene [6,6]-phenyl C61-butyric acid methyl ester (PCBM) as electron acceptor and poly[2-methoxy-5(3 ,7 -dimethyloctyloxy)-p-phenylene vinylene] (OC1C10-PPV) as an electron donor. It is known that a single layer device follows the MIM model [166] and the open circuit voltage V0c is equal to the difference in the work functions of the metal electrodes [134], If charges accumulate in the... 

If the electrodes match the lowest unoccupied molecular orbital (LUMO) of the acceptor and the highest occupied (HOMO) level of the donor, respectively, the contacts can be regarded as ohmic. The maximum Voc for this case is schematically indicated by yoci in Fig. 5.13 and is thus controlled by the bulk active layer material properties. Non-ohmic contacts, as shown in Fig. 5.13, a Voc with magnitude V0c2 should be observed, according to the MIM model. However if the Fermi level of the contact metal is pinned at the LUMO and of the anode with the HOMO, the observed F0c by the properties of the acceptor and the donor and will become insensitive to the work function difference of the electrodes. 

Table 1. The Contributions of Various Electronic Configurations of the MIM model for the State Functions of the PE P model of Phenylazide = Benzene(B) + Azide(A).

Figures are the squares of the coefficients in the state functions expressed as a linear combination of the electronic configurations of the MIM model. G Ground configuration, LE Configuration of the localized excitation, CT Charge transfer configuration. Biu>B2u Eiu The electronic states of benzene...

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