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The polymer/TiO 2  array heterojunction interfacial characteristics can be tailored by balanced dipole effects through integration of TiO 2 -quantum dots (QDs) and N719 at heterojunction interface, resulting in the tunable photovoltaic performance. The changes of  V   oc  with interfacial engineering originate from the shift of the conduction band ( E   c ) edge in the TiO 2  nanorod by the interfacial dipole with different directions (directed away or toward the TiO 2  nanorod). The  J   sc  improvement originates from the enhanced charge separation efficiency with an improved electronic coupling property and better charge transfer property. The balanced dipole effects caused by TiO 2 -QDs and N719 modification on the device  V   oc  are confirmed by the changed built-in voltage  V   bi  and reverse saturation current density  J   s .   Electronic supplementary material  The online version of this article (doi:10.1186/s11671-017-1867-5) contains supplementary material, which is available to authorized users.

Balanced Dipole Effects on Interfacial Engineering for Polymer/TiO2 Array Hybrid Solar Cells