Photoinduced charge carriers

As indicated in the previous section, photoinduced charge carriers in semi-... 

Consequently, the excited state absorption pattern of the polymer/fullerene blend mirrors the absorption of the photoinduced charge carriers, as outlined in the introduction. 

Dyakonov, V., G. Zoriniants, M. Scharber, C.J. Brabec, R.A.J. Janssen, J.C. Hummelen, and N.S. Sariciftci. 1999. Photoinduced charge carriers in conjugated polymer-fullerene composites studied with light-induced electron-spin resonance. Phys Rev B 59 8019. 

Mozer, A.J., G. Dennler, N.S. Sariciftci, M. Westerling, A. Pivrikas, R. Osterbacka, and G. Juska. 2005. Time-dependent mobility and recombination of the photoinduced charge carriers in conjugated polymer/fullerene bulk heterojunction solar cells. Phys Rev B 72 035217. 

At the transition to the highly ordered D o phase, n increases by almost two orders of magnitude and reaches values of the order of 0.1 cm V s . With the exception of organic single crystals, these are the highest values known to date of electronic mobility for photoinduced charge carriers in organic systems. The mobilities are independent of temperature and the externally applied field. 

In a bulk heteroj unction, the D and A components are physically mixed so that they can interact through the entire device s volume (therefore called bulk heterojunction). Indeed, this approach enhances the process of photoinduced charge carrier generation and, thus, short circuit current and power conversion efficiency [1-7, 31,32]. The driving forces relevant for the operation of both D/A bilayer and D A bulk-heterojunction devices are discussed in Section 8.3. 

Fig. 3.13 The designed route for fabrication of H3PW12O40/C3N4 NTs and the separation and transportation of photoinduced charge carriers under visible-light irradiation in this composite material (Reprinted with permission from Ref [123]. Copyright 2014, Elsevier)...

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