eng Oriental Scientific Publishing Company Biosciences Biotechnology Research Asia 0973-1245 2016-06-22 12 Spl.Edn.2 813 820 10.13005/bbra/2264 13689 article A.R.N. Laily 1 S. Hasiah 2 A.N. Dagang 3 O.O. Sulaiman 3 School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia. Centre for Foundation and Liberal Education, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia. School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia. This paper describes the electrical conductivity, Hall Effect study, and efficiency in bulk hetero-junction organic solar cell (OSCs) by using natural pigments Allamanda Cathartica Linn (yellow bell flower) and Ixora coccinea L (Ixora flower). In this work, Indium Tin oxide (ITO) glass as substrate was heated at 50ÚC to 200ÚC. The polymer used was Poly (3- Dodecylthiophene) (P3DT) thin film. These OSCs are fabricated accordingly bulk of ITO/ P3DT+Allamanda Cathartica Linn via electrochemistry method at room temperature. The electrical conductivity of sample was explored by four point probes (FPP) under dark and under light radiation (range of 10 Wm-2 to 200Wm-2). FPP data revealed that electrical conductivity was increased by the increment of light intensity and substrate temperature. In order to obtain the type of sample, Hall mobility, and highest charge carrier, Hall Effect measurement was used. Both samples detected were N-type of charge carrier. The performance of OSCs was successfully improved. https://www.biotech-asia.org/vol12_nospl_edn2/allamanda-cathartica-linn-and-ixora-coccinea-l-as-natural-dye-for-bulk-heterojunction-organic-solar-cell-a-hall-effect-and-electrical-conductivity-study/ Allamanda Cathartica Linn; Ixora coccinea L; Organic Solar cell; Poly (3-Dodecylthiophene); Bulk Heterojunction