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Abstract. The biochar/TiO2 thin layer has been made by sol-gel method and the coating technique by Doctor Blade method. The variation of biochar on TiO2 were 0%, 1%, 2%, 3% and 4%. The characterization was done by XRD (X-Ray Diffractometer) to see the crystal structure of samples. Also, the characterization by UV-Vis spectrophotometer to obtain the value of energy gap. Based on XRD data, it was obtained that the crystal structure of all samples is anatase TiO2. The crystalline size of all samples has no significant different by the increasing of percentage doping. The smallest crystal size was at the addition of 3% and 4% biochar which was 118.22 nm. The results of UV-Vis characterization showed the lowest value of energy gap was at sample doping 1% biochar which was 3.25 eV. Bandgap energy value for doping sample above 1% showed an increase of bandgap energy of Biochar-TiO2.