Erlyta Septa Rosa

Improving the Efficiency of Perovskite Solar Cell through the Addition of Compact Layer under TiO2 Electron Transfer Material

In the fabrication of perovskite solar cells, the perovskite layer is typically deposited onto the TiO2 semiconductor layer. The TiO2 layer serves as an electron transport material (ETM). In order to form the perovskite layer firmly and evenly, a structured mesoporous (MS) TiO2 surface is required. A porous layer could also make the electrons move more quickly through the pores to reach the contact. However, the electron-hole recombination and electron trapping in the dead end pore are still occurred. One of the solutions to overcome this problem is to add a thin compact layer (CL)-TiO2 under MS-TiO2 layer. The CL-TiO2 is expected as to prevent recombination and attract electrons trapped in the MS-TiO2 layer. In this paper, we report the addition of a thin compact layer (CL)-TiO2 under MS-TiO2 layer in the fabrication of perovskite solar cells based on methyl ammonium lead iodide (CH3NH3PbI3). The compact layer TiO2 was grown under mesoporous TiO2 layer by dip-coating in TiCl4 solution. The time of the dip coating was varied to obtain an optimum efficiency improvement. The structure of the device is glass/FTO/CL-TiO2/MS-TiO2/ CH3NH3PbI3/Spiro-OMeTAD/Ag/FTO/glass. It was concluded that the addition of CL-TiO2 can improve the perovskite solar cells power conversion efficiencies. The best efficiency was obtained from the 15 minutes dip-coating, which corresponded to the thinnest CL-TiO2 out of all samples. The electrical characterization performed under irradiation with an intensity of 50 mW/cm2 at 25 °C generated an open circuit voltage of 0.28 V, a short circuit current density of 0.25 mA/cm2 and a power conversion efficiency of 0.60 %.

The influence of the addition of dye surface modifier on the performance of transparent dye sensitized solar cells

The light-harvesting properties and charge injection kinetics of dye molecules play a significant role to improve the performance of dye-sensitized solar cells (DSSC). Dyes based on metal complexes with ruthenium complexes also a variety of metal–organic dyes such as Zn-porphyrin derivatives have been used. The requirements for dye to function as a photosensitizer in DSSC are the absorption in the visible or near-infrared regions of the solar spectrum and the binding to the semiconductor TiO2. In order to interact with the TiO2 surface it is preferable that the dye has a functional group as anchoring group such as carboxylic or other peripheral acidic. The carboxylic group is the most frequently used anchoring group, as in ruthenium-complex based dyes. However, carboxylic acid as an anchoring group is still not enough for conducting in electron injection to TiO2. In this research, 0.87 mg phosphonic acid is added to N719 and Z907 ruthenium-complex based dyes, rspectively, as a surface modifier to strength...

Perovskite/polymer solar cells prepared using solution process

We report a simple solution-based process to fabricate a perovskite/polymer tandem solar cell using inorganic CH3NH3PM3 as an absorber and organic PCBM (6,6 phenyl C61- butyric acid methyl ester) as an electron transport layer. The absorber solution was prepared by mixing the CH3NH3I (methyl ammonium iodide) with PbI2 (lead iodide) in DMF (N,N- dimethyl formamide) solvent. The absorber and electron transport layer were deposited by spin coating method. The electrical characteristics generated from the cell under 50 mW/cm2 at 25 °C comprised of an open circuit voltage of 0.31 V, a short circuit current density of 2.53 mA/cm2, and a power conversion efficiency of 0.42%.

Influences mass concentration of P3HT and PCBM to application of organic solar cells

Poly (3-hexylthiophene) (P3HT) and [6, 6] -phenyl-C61-butyric acid methyl ester (PCBM) are used for the organic solar cell applications. P3HT and PCBM act as donors and acceptors, respectively. In this study the efficiency of the P3HT: PCBM organic solar cells as function of the mass concentration of the blend P3HT: PCBM with 1, 2, 8, 16 mg/ml. Deposition P3HT:PCBM film using spin coating with a rotary speed of 2500 rpm for 10 seconds. Optical properties of absorption spectra characteristic using a UV-Visible Spectrometer Lambda 25 and electrical properties of I-V characteristic using Keithley 2602 instrument. The results of absoption spectra for P3HT:PCBM within different mass concentration obtained 500-600 nm wavelengths. The Energy-gap obtained about 1.9eV. The organic solar cells device performance were investigated using I-V cahractyeristic. For mass concentration of 1, 2, 8 and 16 mg/ml P3HT:PCBM were obtained 0.5×10-3%, 2.2×10-3%, 5.9×10-3%, and 6.1×10-3% efficiency of organics solar cells respectively.

Fabrication of organic solar cells with design blend P3HT: PCBM variation of mass ratio

Organic solar cells of FTO/PEDOT: PSS/P3HT: PCBM/Al has been fabricated, and its performance has been tested in dark and under various illumination of light intensity 1000 W/m2. The active materials used in this study are poly (3- hexylthiophene) (P3HT) and [6, 6]-phenyl-C61-butyric acid methyl ester (PCBM). P3HT is the donor while PCBM acts as an acceptor. Variation of PCBM and P3HT are 1:1, 1:2, 1:3, 1:4 and 1:5. P3HT: PCBM was mixed by chlorobenzene solvents. The mixing was done by using the ultrasonic cleaner. The absorbance characterization using by UV-Visible Spectrometer Lambda 25 instrument and I-V characterization has been tested using a set of 2602A Keithley instrument. Absorbance characterization shows that two peaks are formed. The first peak in the range of 300 to 350 nm which is a range of PCBM and the second peak range from 450 to 600 nm which is a range of P3HT. As the mass ratio increases, the second peak of P3HT increases while the first peak does not change. The gap energy estimated by the Tauc method is 2.0 eV. I-V characterization of the efficiency was obtained. The efficiency of sample 1, 2, 3, 4, and 5 are 5.80x10-2%; 6.46x10-2%; 7.72x10-2%; 8.25x10-2% and 9.81x10-2%, respectively. The highest value of efficiency was obtained at mass ratio 1:5.

The influence of the composition of P3HT:TiO2 on the characteristics of hybrid polymer solar cell

In this paper, a study on the fabrication of hybrid polymer solar cells based on organic semiconductor materials P3HT (poly-3-hexylthiophene) and inorganic semiconductor materials TiO2 (titanium dioxide) has been carried out. The study is focused on the influence of the composition of P3HT and TiO2 on the optical and electrical characteristics of hybrid polymer solar cells. The composition of P3HT and TiO2 are varied with ratios of (1:1), (2:1), and (1:2), respectively, in a concentration of 10 mg/ml. The optical characterization using a UV-Vis spectrometer shows that the higher absorption of the active layer results from the (1:1) ratio of P3HT:TiO2. Based on the electrical characterization, using solar simulator on hybrid polymer solar cells, can be concluded that a mass ratio of P3HT:TiO2 (1:1) gives the best performance, with an open-circuit voltage of 0.2437 volts, a short-circuit current of 0.0029 milliamperes, a maximum power of 0.0002 milliwatts, and a power conversion efficiency of 00006%, at the light intensity of 500 W/m2.

Fabrication of Polymer Solar Cells on Flexible Substrate

Polymer blends are potential candidates for solar-energy conversion, due to their flexibility, ease of processing, and low costs. We report herein 2.6 cm2 active area of flexible polymer solar cells based on blends of polymeric semiconductor [poly (2-methoxy-5-(3,7-dimethyloctyloxy)-(para-phenylene vinylene)] (MDMO-PPV) and the soluble fullerene C60 derivative [6,6 phenyl C61-butyric acid methyl este (PCBM). Devices were prepared by etching an electrode pattern of Indium Tin Oxide (ITO) covered on poly [ethylene terephthalat (PET) substrate. A layer of conducting poly (3,4-ethylenedioxythiophene):poly (styrene sulphonate) (PEDOT:PSS) were screen printed on top of the ITO. Followed by spin coated a polymer blends of MDMO-PPV/PCBM in chlorobenzene onto PEDOT:PSS layer. Finally, evaporation of a silver electrode and PET film lamination completed the devices. The typical overall power efficiency of the prototype devices in an active area of 2.6 cm2 was 0.004 % with open-circuit voltage of 1.473 Volt, short-circuit current of 5.84 x 10-06 Ampere, and maximum power of 2.12 x 10-06 Watt.