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- W2950497745 endingPage "308" @default.
- W2950497745 startingPage "259" @default.
- W2950497745 abstract "This chapter deals with the timely problem of how an optical excitation in an organic solid can dissociate into a pair of charge carriers. Experiments on neat films of C60, PCBM, and selected conjugated polymers as test samples confirm the general notion that the yield of intrinsic photogeneration is very weak because it is controlled by an inefficient Onsager-like autoionization of a higher Franck Condon state. The intrinsic yield can, however, approach 100% in an organic solar cell in which a pair of donor and acceptor moieties forms a bulk heterojunction or bilayer as the active element of the cell. Power efficiencies of 10% and even higher have meanwhile been reported. This is gratifying, yet it is difficult to explain because in organic solids, the relative dielectric constant is 3 to 4. Therefore, the Coulomb binding energy of electron–hole pairs is ought to be up to 0.5 eV and thermally activated escape from the Coulomb well should, therefore, be highly inefficient. In this chapter, we shall discuss (i) the ultrafast initial generation of an electron–hole pair at the donor–acceptor interface from a precursor donor (or acceptor) exciton, (ii) various concepts to rationalize the subsequent escape process of the electron–hole pair from the Coulomb well, and (iii) geminate and nonrecombination recombination processes." @default.
- W2950497745 created "2019-06-27" @default.
- W2950497745 creator A5035558194 @default.
- W2950497745 creator A5080184276 @default.
- W2950497745 date "2019-06-07" @default.
- W2950497745 modified "2023-09-26" @default.
- W2950497745 title "Photogeneration of Charge Carriers in Solution-Processable Organic Semiconductors" @default.
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