Modris Roze

Charge Transport Layer Doping Influence on Perovskite CH3NH3PbI3-xClx Solar Cell Performance

Organometal hybrid trihalide perovskite solar cells (PSCs) have emerged a new class of optoelectronic devices for various applications. PSCs have demonstrated unprecedented progress in efficiency reaching certified power conversion efficiency 22.1% after only several years of active research. In this paper, we demonstrate inverted planar mixed halide perovskite solar cells where perovskite layers are built by two-step modified interdifussion and one-step methods. We demonstrate how PSC parameters change by doping electron transport layer (ETL). We used N,N-dimethyl-N-octadecyl (3-aminopropyl) trimethoxysilyl chloride (DMOAP) as dopant for ETL [6,6]-phenyl C61 butyric acid methyl ester (PCBM). The highest EQE and Voc values were obtained for cell prepared by one-step method with fast crystallization and doped ETL but higher fill factor (FF) and shunt resistance (Rshunt) values were obtained for cells prepared by two-step method with undoped ETL.

Fast Pyrolysis of Rapeseed Oil in Presence of CuO Supported SBA-15 Catalysts

In this study SBA-15 based catalysts loaded with copper oxide were synthesized, characterised and investigated in fast catalytic pyrolysis of rapeseed oil using catalyst mixing method. Results of catalyst characterisation showed that all synthesised samples are mesoporous silica with uniform hexagonal shape cylindrical pores with space group P6mm and average pore size of 6 nm. Supported CuO did not influence the uniform hexagonal shape; however surface area and pore diameter decreased with increasing CuO loading. Investigation of fast pyrolysis of rapeseed oil shows that supporting with CuO suppresses the deoxygenation in form of H2O, CO and CO2 =regardless of the amount of CuO. At the same time supported CuO increased the content of oxygenates in the pyrolysis products = linearly to the CuO amount till 6-8% m/m of CuO. Further scale up the CuO content lowered the yield of oxygenates.

Influence of the Preparation Method on Planar Perovskite CH3NH3PbI3-xClx Solar Cell Performance and Hysteresis

Abstract Organometal halide perovskites are promising materials for lowcost, high-efficiency solar cells. The method of perovskite layer deposition and the interfacial layers play an important role in determining the efficiency of perovskite solar cells (PSCs). In the paper, we demonstrate inverted planar perovskite solar cells where perovskite layers are deposited by two-step modified interdiffusion and one-step methods. We also demonstrate how PSC parameters change by doping of charge transport layers (CTL). We used dimethylsupoxide (DMSO) as dopant for the hole transport layer (PEDOT:PSS) but for the electron transport layer [6,6]-phenyl C61 butyric acid methyl ester (PCBM)) we used N,N-dimethyl-N-octadecyl(3-aminopropyl)trimethoxysilyl chloride (DMOAP). The highest main PSC parameters (PCE, EQE, VOC) were obtained for cells prepared by the one-step method with fast crystallization and doped CTLs but higher fill factor (FF) and shunt resistance (Rsh) values were obtained for cells prepared by the two-step method with undoped CTLs.

PV Effect of Fullerene/Poly(3-Hexylthiophene) Blend Sensitized By Phthalocyanine Having Infrared Absorption Ct Band

An attempt was made to extend the photosensitivity spectral range of fullerene/poly(3-hexylthiophene) blend to NIR region by adding extra electron donor — hydroxygallium phthalocyanine (GaOHPc) with a strong and wide intermolecular charge transfer (CT) band around 830 nm. Multilayer cells of ITO/PEDOT: PSS/6 GaOHPc/P3HT: C61(CO2Et)2 have been prepared by spin coating with vacuum evaporated Al or In top electrodes. Significant photosensitivity of the cells was in 370–900 nm spectral range. However charge carrier photogeneration efficiency was 3 times higher for illumination in P3HT absorption band as compared with the GaOHPc CT band at 830 nm. But when GaOHPc was mixed in the blend forming P3HT:C61(CO2Et)2:GaOHPc active layer its CT band shifted to infrared part at 875 nm. At the same time the charge carrier photogeneration efficiency for illumination in GaOHPc CT band increased significantly, exceeding its value for illumination in P3HT absorption band.