Posted in 18 May 2017, by Mic, kategori News

DSC_0109Thursday (18 / May / 2017), Conference Room of Civil Engineering Department Universitas Brawijaya; Prof. Ir. I.N.G. Wardana, M. Eng., Ph.D., as the Head of Doctoral Study Program of Mechanical Engineering tapped the gavel, marked the graduation of the new doctor on Energy Conversion. Through his dissertation Photoanode Layer Engineering to Improve the Efficiency of Dye-Sensitized Solar Cells (DSSC), Zainal Arifin is entrusted with a cum laude degree.

In the open examination of the Sebelas Maret University lecturer, Prof. Ir. Sudjito Soeparman, Ph.D acted as the Promoter along with Dr. Eng. Denny Widhiyanuriyawan, S.T., M.T., and Prof. Dr. Techn. Suyitno, S.T., M.T., acted as first and second Supervisors. While the board of examiners present Dr. Eng. Mega Nur Sasongko, S.T., M.T, Dr. Eng. Lilis Yuliati, S.T., M.T, and Guest Examiner, Prof. Dr. Ir. Yanuar, M. Eng., M.Sc from the University of Indonesia, Jakarta.

The purpose of this research is to improve the efficiency of dye-sensitized solar cells (DSSC) by fabricating the photoanode layer. In this regard, three types of photoanode layers were constructed. In the first and second types, the photoanode consisted of a single layer of nanoparticles and nanofibers, respectively, and the third was made up of titanium oxide (TiO2) nanoparticles and nanofibers. The photoanode layer with a thickness of 20µm was deposited on fluorine-doped tin oxide (FTO) transparent glass by using the doctor blade method. TiO2 nofibers were synthesized from titanium (IV) isopropoxide (TTIP) solution by electrospinning at a voltage of 15 kV and maintaining the electrode at a distance of 29.5 cm. The core and sheath flow values were maintained at 6 µL/menit m10 µL/menit  respectively. Subsequently, the photoanode layer was immersed in different solutions of N719 (synthetic dye) and papaya leaf extract (natural dye).

The photoanode and dyes were characterized using UV-Vis spectrophotometry, Fourier Transform Infra Red (FTIR) spectroscopy, cyclic voltammetry (CV), Brunauer-Emmett-Teller (BET) technique, Scanning Electron Microscopy (SEM), and X-Ray Diffraction (XRD) spectroscopy. Next, the photoanode layers that were soaked in dye solutions were assembled with the counter electrode and electrolyte to construct DSSC. The resulting DSSC were evaluated under 100 mW/cm² irradiation in order to characterize their performance in terms of current, voltage, fill factor, and efficiency.

Comprehensively, it can be concluded that the design and construction of DSSC by modifying the photoanode layer based on the double-layer concept are successful and a significant improvement in the efficiency of DSSC has been achieved. This improvement is primarily caused by the increase in electric current (Jsc) in DSSC with the incorporation of the photoanode layer (based on the double-layer concept). This indicates that a larger number of photons are converted into electronic charge, which subsequently flows as electrical current. This is because the photoanode layer (based on double layer concept) performs two important roles.

The first leads to an increase in its ability to absorb dyes so that optimal dye loading can be achieved by the nano-sized and uniformly shaped TiO2 layer. The second leads to increased light scattering and decrease in the loss of photon energy in the photoanode layer because of the large-sized and long fiber morphology of the Zn-doped TiO2 nanofiber layer. Therefore, DSSC constructed with photoanode layers (based on the double-layer concept) and synthetic dyes leads to an efficiency of 3.122%. This implies that the efficiency of DSSC (based on the doublelayer concept) is 3.5- old that of DSSC based on a single-layer photoanodes and synthetic dyes. DSSC fabricated with a photoanode layer based on the double-layer concept and natural dye show an efficiency of 0.297%, implying a 4.9-fold increase in the efficiency as compared to those constructed with a single-layer photoanode and natural dyes. In the future, it will be interesting to perform research on the design and construction of DSSC with photoanode layers assembled based on double-layer and multilayer concepts to increase their efficiency, thus enabling them to compete with first-generation commercially available solar cells.

In the future, it will be interesting to perform research on the design and construction of DSSC with photoanode layers assembled based on double-layer and multilayer concepts to increase their efficiency, thus enabling them to compete with first-generation commercially available solar cells.

Present to congratulate and give a speech is The Dean of Faculty of Engineering, Sebelas Maret University, Solo Dr. Techn. Ir. Sholihin As’ad, MT. He hoped the cooperation to improve the quality of human resources with FTUB to be more solid. (emis/mic)

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