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I N T E R A C T I O N B E T W E E NT E T R A H Y D R O F U R A N S O LV E N T A N D Z I N CO X I D E5Contents5.1 Role of the solvent in the synthesis ofhybrids 615.2 Solvent THF interaction with ZnO 635.2.1 Interaction between the THF moleculeand the ZnO surface 635.2.2 Interaction between the THF liquidsolvent and ZnO surface atroom temperature 655.3 Conclusions 695.1 role of the solvent in the synthesis of hybridsOrganic self-assembled interlayers on the electron acceptormetal oxides, can derive not only by intentional modifications(as in the case of ZnPc described in the previouschapter), but can be originated during the synthesis process.In most cases hybrids formed by ZnO and a polymer aresynthesized from solutions by dissolving the semiconductornanostructures and the organic components into suitablesolvents without the need of expensive vacuum conditions.For example, by spin-coating [104] a drop of solutioncontaining ZnO nanorods and a conjugate polymer (suchas P3HT) can be centrifugated over a substrate in air conditions(see Figure 5.1). After solvent evaporation a thin filmof organic-inorganic material is deposited.The final microstructure and the photoconversion efficiencyof the corresponding hybrid strongly depend onthe processing conditions. In particular, the type of solventadopted can cause a large change (up to two orders of magnitude)in the efficiency [57].61