Donor-Acceptor Interfacial Interactions Dominate Device Performance in Hybrid P3HT-ZnO Nanowire-Array Solar Cells

作者：Whittaker Brooks Luisa; McClain William E; Schwartz Jeffrey; Loo Yueh Lin^*

来源：Advanced Energy Materials, 2014, 4(16): 1400585.

DOI：10.1002/aenm.201400585

The adsorption of self-assembled monolayers (SAMs) on metal oxide surfaces is a promising route to control electronic characteristics and surface wettability. Here, arylphosphonic acid derivatives are used to modulate the surface properties of vertically oriented ZnO nanowire arrays. Arylphosphonate-functionalized ZnO nanowires are incorporated into hybrid organic-inorganic solar cells in which infiltrated poly(3-hexylthiophene) (P3HT) serves as the polymer donor. Strong correlations between device short-circuit current density (J(sc)) and power conversion efficiencies (PCEs) with ZnO surface functionalization species are observed and a weak correlation in the open-circuit voltage (V-oc) is observed. Inverted solar cells fabricated with these treated interfaces exhibit PCEs as high as 2.1%, primarily due to improvements in J(sc). Analogous devices using untreated ZnO arrays having efficiencies of 1.6%. The enhancement in J(sc) is attributed to surface passivation of ZnO by SAMs and enhanced wettability from P3HT, which improve charge transfer and reduce carrier recombination at the organic-inorganic interface in the solar cells.

• 出版日期2014-11-18