**5.4. Polymer-semiconductor structure configuration**

In 2002 Huynh and his coworkers [32] investigated photovoltaic action in hybrid nanorodspolymer solar cells and under Air Mass (A.M.) 1.5 Global solar conditions, a power conversion efficiency of 1.7 % was obtained. This works and others encouraged many groups to investigate incorporation of quantum dots in polymers. Quantum dots are dispersed in organic-semicon‐ ductor polymer matrices. For example, in a hole-conducting polymer such as MEH-PPV (poly(2-methoxy,5-(2-ethyl)-hexyloxy-pphenylenevinylene) disordered arrays of CdSe quantum dots are synthesized. When the cell illuminated, the absorbed photons results in photo-generated carriers. As illustrated in Figure 16 [31], the photo-generated holes are injected into the MEH-PPV polymer phase which is in contact with metallic electrode to facilitate their collection.Sun et al., in 2003 reported that solar power conversion efficiencies of 1.8 % were achieved under AM1.5 illumination fora device containing 86 wt % of quantum dots [33].
