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Molecular Design of Interfacial Modifiers for Polymer‐Inorganic Hybrid Solar Cells
Author(s) -
Yu Jusfong,
Shen TsungLung,
Weng WeiHsiang,
Huang YuChen,
Huang ChingI,
Su WeiFang,
Rwei SyangPeng,
Ho KuoChuan,
Wang Leeyih
Publication year - 2012
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201100581
Subject(s) - homo/lumo , materials science , thiophene , density functional theory , photocurrent , polythiophene , quantum efficiency , cyanoacetic acid , cyclic voltammetry , energy conversion efficiency , dipole , photochemistry , conjugated system , polymer solar cell , molecule , chemistry , optoelectronics , polymer , conductive polymer , computational chemistry , electrochemistry , organic chemistry , electrode , composite material
The heterojunction of poly(3‐hexylthiophene) (P3HT) and TiO 2 in hybrid solar cells is systematically engineered with four cyanoacrylic acid‐containing conjugated molecules with various lowest unoccupied molecular orbital (LUMO) levels, WL‐1 to WL‐4, which are prepared by the formylation of thiophene derivatives in a Vilsmeier–Haack reaction, followed by treatment with cyanoacetic acid. The optical characteristics, redox properties, and intrinsic dipole moments of these interfacial modifiers (IMs) are examined using UV‐vis spectrophotometry, cyclic voltammetry, and density functional theory calculations. Using cyanoacrylic acid as a terminal anchoring group in IMs increases the electron affinity in regions close to the titania surface and forms a molecular dipole that is orientated away from the TiO 2 surface, enabling both open‐circuit voltage ( V OC ) and short‐circuit current density to be increased simultaneously. Photovoltaic measurements demonstrate that V OC increases with the dipole moment of IMs along the molecular backbone. Moreover, the external quantum efficiency (EQE) spectra display a bimodal distribution, revealing that both IMs and P3HT contribute to the photocurrent. The EQE at 570 nm is identified as characteristic of P3HT. More importantly, the LUMO of the IMs decisively determines the dissociation efficiency of P3HT excitons. The device based on P3HT/WL‐4/TiO 2 exhibits the highest power conversion efficiency of 2.87%.