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Sains Malaysiana
40(2)(2011): 173–176
Determination of HOMO and LUMO of
[6,6]-Phenyl C61-butyric Acid3-ethylthiophene Ester and Poly
(3-octyl-thiophene-2, 5-diyl) through Voltametry Characterization
(Penentuan HOMO dan LUMO Asid [6,6]-Fenil C61-butirik Ester 3-etiltiofena dan Poli
(3-oktil-tiiofena-2, 5-diyl) menerusi Pencirian Voltametri)
Ashkan Shafiee, Muhamad Mat Salleh*
Institute of Microengineering and Nanoelectronics (IMEN)
Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia
Muhammad Yahaya
School of Applied Physics, Faculty of Science and Technology
University Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia
Received: 29 December 2009 / Accepted: 9 July 2010
ABSTRACT
HOMO and LUMO of organic compounds are basic parameters for the design and
fabrication of an organic solar cell. This paper presents a technique to obtain HOMO and LUMO of an n-type polymer of
[6,6]-phenyl C61-butyric acid 3-ethylthiophene ester (PCBE)
and a p-type polymer of poly (3-octyl-thiophene-2, 5-diyl) (P3OT). The energy
of band gap for each material has been calculated using optical absorption
spectrum. Cyclic Voltammetry was used to estimate the oxidation potential and
energy band diagram consequently. The experiments were carried out in a
three-electrode cell consisting of a platinum working electrode, a platinum
counter electrode and a SCE reference electrode. P3OT showed
energy band gap equal to 1.83 eV with HOMO and LUMO equal
to 5.59 eV and 3.76 eV, respectively. PCBE showed energy band gap
equal to 1.96 eV with HOMO and LUMO equal
to 5.87 eV and 3.91 eV, respectively. Based on energy band diagram that was
constructed from this experimental result, the couple materials may be
successfully used to fabricate the feasible organic solar cells.
Keywords: Cyclic
voltametry; donor-acceptor materials; organic solar cells
ABSTRAK
HOMO dan LUMO adalah parameter asas dalam merekabentuk dan fabrikasi suatu sel
suria organik. Kertas ini mengemukakan suatu teknik untuk mendapat HOMO dan LUMO suatu polimer jenis-n, asid
[6,6]-fenil C61-butirik sster 3-etiltiofena (PCBE),
dan suatu polimer jenis-p, poli (3-oktil-tiiofena-2, 5-diyl) (P3OT). Jurang
jalur tenaga tiap-tiap bahan dikira daripada spektrum serapan optik. Voltametri
berkitar diguna untuk menganggarkan keupayaan pengoksidaan dan seterusnya
gambar rajah jalur tenaga. Uji kaji dijalankan menggunakan sel tiga-elektrod
yang terdiri daripada suatu elektrod kerja platinum, satu elektrod lawan
platinum dan elektrod rujukan SCE. Bagi P3OT jurang jalur
tenaga adalah 1.83 eV dengan HOMO dan LUMO masing-masing
berpadanan 5.59 eV dan 3.76 eV. Sementara itu PCBE telah
menunjukkan jurang tenaga bersamaan 1.96 eV dengan HOMO dan LUMO masing-masing berpadanan 5.87 eV dan 3.91 eV. Berasaskan kepada
gambar rajah yang dibina hasil eksperimen ini, dijangkakan gandingan dua bahan
berkenaan dapat difabrikasi untuk menghasilkan sel suria organik yang baik.
Kata kunci: Bahan
penderma-penerima; sel suria organik; voltometri berkitar
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*Corresponding author; email: mms@ukm.my
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