Browsing Cietvielu fizikas institūts / Institute of Solid State Physics by Author "Vembris, Aivars"
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4.9% Efficient Sb2S3 Solar Cells from Semitransparent Absorbers with Fluorene-Based Thiophene-Terminated Hole Conductors
Mandati, Sreekanth; Juneja, Nimish; Katerski, Atanas; Jegorovė, Aistė; Grzibovskis, Raitis; Vembris, Aivars; Dedova, Tatjana; Spalatu, Nicolae; Magomedov, Artiom; Karazhanov, Smagul; Getautis, Vytautas; Krunks, Malle (American Chemical Society, 2023)Fluorene-based hole transport materials (HTMs) with terminating thiophene units are explored, for the first time, for antimony sulfide (Sb2S3) solar cells. These HTMs possess largely simplified synthesis processes and high ... -
Development of Bi2S3 thin film solar cells by close-spaced sublimation and analysis of absorber bulk defects via in-depth photoluminescence analysis
Koltsov, M.; Gopi, S.V.; Raadik, T.; Krustok, J.; Josepson, R.; Gržibosvkis, Raitis; Vembris, Aivars; Spalatu, N. (Elsevier, 2023)The emergence of new PV applications in society requires the design of new materials and devices based on green and earth-abundant elements, with a different set of properties and wider applicability. In this perspective, ... -
Development of Bi2S3 thin film solar cells by close-spaced sublimation and analysis of absorber bulk defects via in-depth photoluminescence analysis
Koltsov, M.; Gopi, S.V.; Raadik, T.; Krustok, J.; Josepson, R.; Grzibovskis, Raitis; Vembris, Aivars; Spalatu, N. (Elsevier, 2023)The emergence of new PV applications in society requires the design of new materials and devices based on green and earth-abundant elements, with a different set of properties and wider applicability. In this perspective, ... -
Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
Ruduss, Armands; Kokars, Valdis; Tetervenoka, Natalija; Vembris, Aivars; Traskovskis, Kaspars (Royal Society of Chemistry, 2020)Iridium(iii) complexes are the most frequently applied commercialized green and red emitters for organic light emitting diode (OLED) displays. Throughout years a significant research effort has been devoted to modify these ... -
Energy level determination in bulk heterojunction systems using photoemission yield spectroscopy: case of P3HT:PCBM
Grzibovskis, Raitis; Vembris, Aivars (Springer New York LLC, 2018)Ultraviolet photoelectron spectroscopy (UPS) is commonly used method for energy level determination using planar heterojunction samples in either metal/organic or organic/organic systems. Only some attempts have been made ... -
Energy level determination of purine containing blue light emitting organic compounds
Grzibovskis, Raitis; Vembris, Aivars; Sebris, Armands; Kapilinskis, Zigfrids; Turks, Maris (SPIE - International Society for Optics and Photonics, 2018)Organic light emitting diodes (OLED) have found their applications in the mobile and TV screens. Till now the commercially available diodes are made by expensive thermal evaporation in a vacuum. The costs of OLED fabrication ... -
Glass-forming nonsymmetric DWK-dyes with 5,5,5-triphenylpentyl and piparazine moieties for light-amplification studies
Zarins, Elmars; Puciriuss, Toms; Pervenecka, Julija; Vembris, Aivars; Kokars, Valdis (SPIE, 2018)A series of 2,6-bis-styryl-4H-pyran-4-ylidene fragment containing glass-forming organic compounds with bonded amorphous phase promoting bulky triphenyl moieties through piperazine structural fragment [2-(2-(4-(bis(2-(tri ... -
Influence of organic material and sample parameters on the surface potential in Kelvin probe measurements
Grzibovskis, Raitis; Vembris, Aivars (Springer New York LLC, 2019)Scanning Kelvin probe is a method for material surface studies. It is used to determine the work function of metals. In the case of organic semiconductors, the measured surface potential is considered to be the Fermi level ... -
Intrinsic Photoconductivity Spectral Dependence as a Tool for Prediction of Open-Circuit Voltage in Organic Solar Cells
Grzibovskis, Raitis; Polaks, Andis; Vembris, Aivars (MDPI, 2023)Organic materials are known for their variety of molecules. Methods to predict the parameters of organic photovoltaic (OPV) cells are required to avoid the time- and resource-consuming processes of manufacturing and testing ... -
Investigation of photoluminescence and amplified spontaneous emission properties of cyanoacetic acid derivative (KTB) in PVK amorphous thin films
Pervenecka, Julija; Vembris, Aivars; Zarins, Elmars; Kokars, Valdis (SPIE, 2018)In this work photoluminescence and amplified spontaneous emission properties of new original 2-cyanoacetic acid derivative in different concentration mixed in polyvinyl carbazole (PVK) matrix were investigated. Ethyl ... -
Low processing temperatures explored in Sb2S3 solar cells by close-spaced sublimation and analysis of bulk and interface related defects
Krautmann, R.; Spalatu, N.; Josepson, R.; Nedzinskas, R.; Kondrotas, R.; Grzibovskis, Raitis; Vembris, Aivars; Krunks, M.; Oja Acik, I. (Elsevier, 2023)Antimony trisulfide (Sb2S3) is a promising photovoltaic absorber, which has so far been fabricated mainly by chemical deposition methods. Despite its aptness for congruent sublimation, less research efforts have been made ... -
New Electroactive Polymers with Electronically Isolated 4,7-Diarylfluorene Chromophores as Positive Charge Transporting Layer Materials for OLEDs
Krucaite, Gintere; Tavgeniene, Daiva; Blazevicius, Dovydas; Zhang, Baohua; Vembris, Aivars; Grigalevicius, Saulius (MDPI, 2021)A group of polyethers containing electroactive pendent 4,7-diarylfluorene chromophores have been prepared by the multi-step synthetic route. Full characterization of their structures has been presented. The polymeric ... -
Photophysical and Electrical Properties of Highly Luminescent 2/6-Triazolyl-Substituted Push-Pull Purines
Sebris, Armands; Novosjolova, Irina; Traskovskis, Kaspars; Kokars, Valdis; Tetervenoka, Natalija; Vembris, Aivars; Turks, Māris (American Chemical Society, 2022)New push-pull N(9)-alkylated 6-piperidino-2-triazolylpurine and 2-piperidino-6-triazolylpurine derivatives are synthesized, and their optical and optoelectronic properties are comprehensively characterized with experimental ... -
Photovoltaic effect in bulk heterojunction system with glass forming indandione derivative DMABI-6Ph
Latvels, Janis; Grzibovskis, Raitis; Pudzs, Kaspars; Vembris, Aivars; Blumberga, Dagnija (Elsevier Ltd, 2018)The aim of the work is to evaluate possible use of 2-[[4-(bis(2-trityloxyethyl)amino)phenyl]methylene]indane-1,3-dione (DMABI-6Ph) as light absorbing material for solar cells. DMABI-6Ph is a perspective material due to its ... -
Post deposition annealing effect on properties of CdS films and its impact on CdS/Sb2Se3 solar cells performance
Gopi, Sajeesh Vadakkedath; Spalatu, Nicolae; Basnayaka, Madhawa; Katerski, Atanas; Josepson, Raavo; Grzibovskis, Raitis; Vembris, Aivars; Krautmann, Robert; Krunks, Malle; Acik, Ilona Oja (Frontiers Media, 2023)Antimony selenide (Sb2Se3) is one of the emerging photovoltaic absorber materials possessing abundance and non-toxicity as the main attributes. Following CdTe technology, CdS is a widely used partner layer for Sb2Se3 solar ... -
Sb2S3 solar cells with a cost-effective and dopant-free fluorene-based enamine as a hole transport material
Juneja, Nimish; Mandati, Sreekanth; Katerski, Atanas; Spalatu, Nicolae; Daskeviciute-Geguziene, Sarune; Vembris, Aivars; Karazhanov, Smagul; Getautis, Vytautas; Krunks, Malle; Oja Acik, Ilona (Royal Society of Chemistry, 2022)Antimony sulphide (Sb2S3) is a promising candidate for semi-transparent and tandem solar cells owing to its suitable optoelectronic properties. However, the applications of Sb2S3 solar cells are rather limited by their low ... -
Sb2S3 Thin-Film Solar Cells Fabricated from an Antimony Ethyl Xanthate Based Precursor in Air
Eensalu, Jako S.; Mandati, Sreekanth; Don, Christopher H.; Finch, Harry; Dhanak, Vinod R.; Major, Jonathan D.; Grzibovskis, Raitis; Tamm, Aile; Ritslaid, Peeter; Josepson, Raavo; Käämbre, Tanel; Vembris, Aivars (American Chemical Society, 2023)The rapidly expanding demand for photovoltaics (PVs) requires stable, quick, and easy to manufacture solar cells based on socioeconomically and ecologically viable earth-abundant resources. Sb2S3 has been a potential ... -
Stimulated emission and optical properties of pyranyliden fragment containing compounds in PVK matrix
Vembris, Aivars; Zarins, Elmars; Kokars, Valdis (Elsevier Ltd, 2017)Organic solid state lasers are thoughtfully investigated due to their potential applications in communication, sensors, biomedicine, etc. Low amplified spontaneous emission (ASE) excitation threshold value is essential for ... -
Thin film organic thermoelectric generator based on tetrathiotetracene
Pudzs, Kaspars; Vembris, Aivars; Rutkis, Martins; Woodward, Simon (Wiley-VCH Verlag, 2017)Thin films of p- and n- type organic semiconductors for thermo-electrical (TE) applications are produced by doping of tetrathiotetracene (TTT). To obtain p-type material TTT is doped with iodine during vacuum deposition ...