HSCs have been extensively studied for many years. Although the conjugated polymers could play a crucial role in determining the efficiencies of HSCs, much of the research interests have been paid to the development of the inorganic nanocrystals. Although some new polymers with robust light harvesting properties and photovoltaic performances have been developed for organic solar cells [43-46], few have yet been used into HSCs [47]. By now, most of the HSCs are based on polythiophene and poly(p-phenylene vinylene) and their derivatives are shown in Fig. 9.4. Herein, we will not discuss much about the conjugated polymers but focus on the proceedings in inorganic nanocrystals from the point of view of their
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micromorphologies, i. e., nanoparticles, nanorods and nanorod-, nanowire-, and nanowire arrays. The micromorphologies of inorganic nanocrystals may have profound effect on the performance of HSCs [9, 48].
