Ms. Ching Sum Hui Profile

Ching Sum Hui

at Univ of Hong Kong

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Proceedings Article | 6 February 2004 Paper

Fabrication of photovoltaic cell from rhenium-containing polymer

Ching Sum Hui, Hei Ling Wong, Chung Yin Kwong, Wai Kin Chan, Aleksandra B. Djurisic

Proceedings Volume 5215, (2004) https://doi.org/10.1117/12.505328

KEYWORDS: Polymers, Rhenium, Photovoltaics, Absorption, Electron transport, Metals, Electrodes, Aluminum, Quantum efficiency, Solar cells

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Photovoltaic devices were fabricated using rhenium bis(arylimino)acenaphthene (DIAN) complex containing poly(p-phenylenevinylene). These polymers absorb strongly in the visible region at ca. 440-550 nm. In addition, this type of transition metal based polymers have been shown to exhibit large photo-sensitivity due to the presence of the rhenium complex, which has a relatively long-lived Metal-to-Ligand Charge Transfer (MLCT) character. By using this type of polymers, the metal content can be adjusted easily by simply changing the monomer feed ratio. Moreover, the excited state properties and electronic absorption properties can be modified by varying the structure of the diimine ligand coordinated to the metal. This approach allows us to fine-tune the absorption spectra of the polymers by employing different types of rhenium complex derivatives. PEDOT:PSS and PTCDI were used as the hole and electron transport layers, respectively. The ITO/PEDOT:PSS/DIAN-PPV/PTCDI/Al devices were found to exhibit photovoltaic response under the illumination of AM1 solar radiation. The short-circuit current I_sc, open-circuit voltage V_oc, and the fill factor FF were measured to be 38 μA/cm², 0.93 V and 0.21 respectively. Another photovoltaic device was prepared with the structure ITO/PEDOT:PSS/DIAN-PPV:TiO₂/PTCDI/Al and its photovoltaic properties were studied. The presence of TiO₂ will assist the electron transport of the DIAN-PPV to the PTCDI, in which the electrons can be collected at the aluminium electrode. The short-circuit current I_sc, open-circuit voltage V_oc, and the fill factor FF were measured to be 51 μA/cm², 1.18 V and 0.12 respectively. It was observed that the power conversion efficiency of photovoltaic devices related closely to the rhenium content and the structure of the rhenium complex used.

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