scholarly journals Investigation of Dye Dopant Influence on Electrooptical and Morphology Properties of Polymeric Acceptor Matrix Dedicated for Ternary Organic Solar Cells

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4099
Author(s):  
Gabriela Lewińska ◽  
Piotr Jeleń ◽  
Jarosław Kanak ◽  
Łukasz Walczak ◽  
Robert Socha ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Luminescence Spectra ◽  
Energy Bands ◽  
X Ray ◽  
Organic Layers ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Spectroscopy Studies

The publication presents the results of investigations of the influence of dye dopant on the electrooptical and morphology properties of a polymeric donor:acceptor mixture. Ternary thin films (polymer:dye:fullerene) were investigated for potential application as an active layer in organic solar cells. The aim of the research is to determine the effect of selected dye materials (dye D131, dye D149, dye D205, dye D358) on the three-component layer and their potential usefulness as an additional donor in ternary cells, based on P3HT donor and PC71BM acceptor. UV–vis spectroscopy studies were performed, and absorption and luminescence spectra were determined. Ellipsometry parameters for single dye and ternary layers have been measured. The analyses were performed using the Raman spectroscopy method, and the Raman spectra of the mixtures and single components have been determined. Organic layers were prepared and studied using scanning electron microscope and atomic force microscope. For dyes, ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy studies were carried out and the ternary system was presented and analyzed in terms of energy bands.

Synthesis and Characterization of Nb-Doped TiO2 Thin Films Prepared by RF Magnetron Sputtering

2015 ◽  
Vol 1117 ◽  
pp. 139-142 ◽  
Author(s):  
Marius Dobromir ◽  
Radu Paul Apetrei ◽  
A.V. Rogachev ◽  
Dmitry L. Kovalenko ◽  
Dumitru Luca
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Photoelectron Spectroscopy ◽  
Rf Magnetron Sputtering ◽  
X Ray ◽  
Force Microscopy ◽  
Glass Substrates ◽  
Atomic Force ◽  
Vis Spectroscopy ◽  
Diffraction Patterns

Amorphous Nb-doped TiO2 thin films were deposited on (100) Si and glass substrates at room temperature by RF magnetron sputtering and a mosaic-type Nb2O5-TiO2 sputtering target. To adjust the amount of the niobium dopant in the film samples, appropriate numbers of Nb2O5 pellets were placed on the circular area of the magnetron target with intensive sputtering. By adjusting the discharge conditions and the number of niobium oxide pellets, films with dopant content varying between 0 and 16.2 at.% were prepared, as demonstrated by X-ray photoelectron spectroscopy data. The X-ray diffraction patterns of the as-deposited samples showed the lack of crystalline ordering in the samples. Surfaces roughness and energy band gap values increase with dopant concentration, as showed by atomic force microscopy and UV-Vis spectroscopy measurements.

scholarly journals Neutron reflectometry and hard X-ray photoelectron spectroscopy study of the vertical segregation of PCBM in organic solar cells

2019 ◽  
Vol 191 ◽  
pp. 62-70 ◽  
Author(s):  
Antonio Urbina ◽  
José Abad ◽  
Antonio J. Fernández Romero ◽  
Jesús S. Lacasa ◽  
Jaime Colchero ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Neutron Reflectometry ◽  
Spectroscopy Study ◽  
X Ray ◽  
Vertical Segregation

scholarly journals Properties of Thermally Evaporated Titanium Dioxide as an Electron-Selective Contact for Silicon Solar Cells

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 678 ◽  
Author(s):  
Changhyun Lee ◽  
Soohyun Bae ◽  
HyunJung Park ◽  
Dongjin Choi ◽  
Hoyoung Song ◽  
...  
Keyword(s):  
Solar Cells ◽  
Titanium Oxide ◽  
Photoelectron Spectroscopy ◽  
Oxide Films ◽  
Open Circuit ◽  
Band Alignment ◽  
Silicon Solar Cells ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Titanium Oxide Films

Recently, titanium oxide has been widely investigated as a carrier-selective contact material for silicon solar cells. Herein, titanium oxide films were fabricated via simple deposition methods involving thermal evaporation and oxidation. This study focuses on characterizing an electron-selective passivated contact layer with this oxidized method. Subsequently, the SiO2/TiO2 stack was examined using high-resolution transmission electron microscopy. The phase and chemical composition of the titanium oxide films were analyzed using X-ray diffraction and X-ray photoelectron spectroscopy, respectively. The passivation quality of each layer was confirmed by measuring the carrier lifetime using quasi-steady-state photoconductance, providing an implied open circuit voltage of 644 mV. UV–vis spectroscopy and UV photoelectron spectroscopy analyses demonstrated the band alignment and carrier selectivity of the TiO2 layers. Band offsets of ~0.33 and ~2.6 eV relative to the conduction and valence bands, respectively, were confirmed for titanium oxide and the silicon interface.

scholarly journals Interface Study of ITO/ZnO and ITO/SnO2Complex Transparent Conductive Layers and Their Effect on CdTe Solar Cells

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Tingliang Liu ◽  
Xing Zhang ◽  
Jingquan Zhang ◽  
Wenwu Wang ◽  
Lianghuan Feng ◽  
...  
Keyword(s):  
Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Minority Carrier ◽  
Rf Magnetron Sputtering ◽  
X Ray ◽  
Cdte Solar Cells ◽  
Carrier Recombination ◽  
Vis Spectroscopy ◽  
Interface Characteristic ◽  
Interface Study

Transparent ITO/ZnO and ITO/SnO2complex conductive layers were prepared by DC- and RF-magnetron sputtering. Their structure and optical and electronic performances were studied by XRD, UV/Vis Spectroscopy, and four-probe technology. The interface characteristic and band offset of the ITO/ZnO, ITO/SnO2, and ITO/CdS were investigated by Ultraviolet Photoelectron Spectroscopy (UPS) and X-ray Photoelectron Spectroscopy (XPS), and the energy band diagrams have also been determined. The results show that ITO/ZnO and ITO/SnO2films have good optical and electrical properties. The energy barrier those at the interface of ITO/ZnO and ITO/SnO2layers are almost 0.4 and 0.44 eV, which are lower than in ITO/CdS heterojunctions (0.9 eV), which is beneficial for the transfer and collection of electrons in CdTe solar cells and reduces the minority carrier recombination at the interface, compared to CdS/ITO. The effects of their use in CdTe solar cells were studied by AMPS-1D software simulation using experiment values obtained from ZnO, ITO, and SnO2. From the simulation, we confirmed the increase ofEff, FF,Voc, andIscby the introduction of ITO/ZnO and ITO/SnO2layers in CdTe solar cells.

scholarly journals Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Ying Zhang ◽  
Kuan Liu ◽  
Jiaming Huang ◽  
Xinxin Xia ◽  
Jiupeng Cao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Phase Separation ◽  
Organic Solar Cells ◽  
Photoelectron Spectroscopy ◽  
Bulk Heterojunction ◽  
Depth Profiling ◽  
Grazing Incidence ◽  
X Ray Diffraction ◽  
X Ray ◽  
Xrd Techniques

AbstractGraded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.

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