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Optimizing the component ratio of PEDOT:PSS by water rinse for high efficiency organic solar cells over 16.7%
摘要： For the state-of-the-art organic solar cells, PEDOT:PSS is the most popularly used hole transport material for the conventional structure. However, it still suffers from several disadvantages, such as low conductivity and harm to ITO due to the acidic PSS. Herein, a simple method is introduced to enhance the conductivity and remove the additional PSS by water rinsing the PEDOT:PSS films. The photovoltaic devices based on the water rinsed PEDOT:PSS present a dramatic improvement in efficiency from 15.98% to 16.75% in comparison to that of the untreated counterparts. Systematic characterization and analysis reveal that although part of the PEDOT:PSS is washed away, it still leaves a smoother film and the ratio of PEDOT to PSS is higher than before in the remaining films. It can greatly improve the conductivity and reduce the damage to substrates. This study demonstrates that finely modifying the charge transport materials to improve conductivity and reduce defeats has great potential for boosting the efficiency of organic solar cells.
关键词： PEDOT:PSS,Organic solar cell,water rinse,high efficiency
更新于2025-09-12 10:27:22
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Exploring chemical interaction between Diiodooctane and PEDOT-PSS electrode for metal electrode-free non-fullerene organic solar cells
摘要： Metal electrode-free organic solar cells with printable top electrode are attractive to realize the low cost of photovoltaics. Interaction between the printable electrode and active layer is critical to the device performance. In this work, we report on chemical interaction between printable polymer electrode poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) and typically used additive of 1,8-Dioodooctane (DIO) in active layer. DIO can be converted to HI under the acidic condition of PEDOT:PSS, and the HI chemically reduces the PEDOT:PSS with the appearance of absorbance band at 800-1100 nm. The generation of I2 is verified by the color change of starch. The reaction results in decrease of its work function that hinders the efficient hole collection. A strategy is proposed to circumvent the detrimental interaction by inserting an ultrathin (15 nm) active layer without DIO between the initial active layer and PEDOT:PSS electrode. A power conversion efficiency (PCE) of 10.1% is achieved for the metal electrode-free non-fullerene organic solar cells.
关键词： PEDOT:PSS,1,8-Diiodooctane,chemical interaction,water transfer printing,organic solar cell,non-fullerene
更新于2025-09-12 10:27:22
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Multifunctional semitransparent organic solar cells with excellent infrared photon rejection
摘要： Semitransparent organic solar cells (ST-OSCs) have the potentials to open promising applications that differ from those of conventional inorganic ones, such as see-through power windows with both energy generation and heat insulation functions. However, to achieve so, there remain significant challenges, especially for balancing critical parameters, such as power conversion efficiency (PCE), average visible transparency (AVT) and low energy infrared photon radiation rejection (IRR) to realize the full potentials of ST-OSCs. Herein, we demonstrate the new design of ST-OSCs through the rational integration of organic materials, transparent electrode and infrared photon reflector in one device. With the assistance of optical simulation, new ST-OSCs with precise layout exhibit state-of-art performance, with near 30% AVT and PCE of 7.3%, as well as an excellent IRR of over 93% (780–2500 nm), representing one of best multifunctional ST-OSCs with promising perspective for window application.
关键词： Distributed Bragg reflector,Semitransparent organic solar cell,Ultrathin silver,Average visible transparency,Infrared radiation rejection
更新于2025-09-12 10:27:22
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An Electrode Design Rule for Organic Photovoltaics Elucidated Using a Low Surface Area Electrode
摘要： It is widely considered that charge carrier extraction in bulk-heterojunction organic photovoltaics (BHJ OPVs) is most efficient when the area of contact between the semiconductor layers and the electrodes is maximized and the electrodes are electrically homogeneous. Herein, it is shown that ≈99% of the electrode surface can in fact be insulating without degrading the efficiency of charge carrier extraction, provided the spacing of the conducting areas is less than or equal to twice the optimal thickness of the BHJ layer. This striking result is demonstrated for BHJ OPVs with both conventional and inverted device architectures using two different types of BHJ OPVs, namely, PCDTBT:PC70BM and the ternary blend PBDB-T:ITIC-m:PC70BM. This finding opens the door to the use of a large pallet of materials for optical spacers and charge transport layers, based on a low density of conducting particles embedded in a wide bandgap insulating matrix.
关键词： nanoparticle electrode,organic photovoltaic,gold nanoparticle,transparent electrode,polymer solar cell,organic solar cell
更新于2025-09-11 14:15:04
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Static bending and free vibration of organic solar cell resting on Winkler-Pasternak elastic foundation through the modified strain gradient theory
摘要： Organic solar cell (OSC), which is deemed to be the most promising third generation solar energy application, is developing vigorously. Based on the modified strain gradient theory (MSGT) and the refined shear deformation plate theory, static bending and free vibration of the size-dependent OSC are thoroughly investigated in this paper. A Winkler-Pasternak elastic foundation is considered for the OSC. A multiscale suitable plate analysis framework (i.e., both macro- and micro plates can be handled) is developed herein. Three length scale parameters are incorporated in the presented analysis to capture the size-dependency of the OSC. By setting two or three of them into zero, the presented model could degenerate into the modified couple stress theory (MCST) and the classical plate theory (CPT). The derivation of the governing equations and the corresponding boundary conditions are conducted by Hamilton principle. The Navier-type solution is employed for solving the governing equations of the simply supported OSC. The accuracy of the presented method is validated. Extensive numerical experiments have been conducted to investigate the differences between the adopted MSGT, the MCST and the CPT. Moreover, the impacts of the geometrical configuration as well as the elastic foundation parameters on the static bending and free vibration characteristics are illustrated in the numerical studies. This paper also explores the thickness of the active layer effect on the free vibration behaviour in combination with the power conversion efficiency (PCE) of the OSC.
关键词： Structural analysis,Modified strain gradient theory,Organic solar cell
更新于2025-09-11 14:15:04
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Suppressing the Excessive Aggregation of Non‐Fullerene Acceptor in Blade‐Coated Active Layer by Using n‐Type Polymer Additive to Achieve Large‐Area Printed Organic Solar Cells with Efficiency over 15%
摘要： In this study, we demonstrate that high-efficiency blade-coated organic solar cells (OSCs) can be obtained by using polymer additive N2200 to suppress the excessive aggregation of non-fullerene acceptor. When using blade-coating, OSCs based on the blends of PM6:IT-4F and PM6:Y6 show moderate efficiencies of 9.9% and 13.2%, respectively. However, when a small amount of N2200 is added into the binary active layers, the resulting blade-coated OSCs show much higher efficiencies of 13.0% and 16.0%. Careful investigation reveals that the polymer additive suppresses the excessive aggregation of non-fullerene acceptors in the blade-coated active layer. This enhances the device performance by ensuring a more favorable morphology with appropriate domain size, improving charge extraction, and suppressing charge recombination. Based on these understanding, large-area OSC devices (1.0 cm2) are successfully obtained by blade-coating, which display encouraging efficiencies of 12.3% and 15.1%.
关键词： highly efficient,blade-coating,suppress aggregation,organic solar cell,large-area device
更新于2025-09-11 14:15:04
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Discussion of Photovoltaic Mechanisms of Organic Semiconductor Solar Cells; 有機半導体太陽電池の発電機構に関する一考察;
摘要： We have studied photovoltaic mechanisms of an organic solar cell using phthalocyanine for a p-type semiconductor and fullerene C60 for an n-type semiconductor in quantum chemistry simulation. This study examines computation of the electronic state of the phthalocyanine–fullerene C60 bimolecular system in the ground state by the DFT method using long-range corrected hybrid functional CAM-B3LYP. Some double bonds in unimolecular phthalocyanine become semi-double bonds in the bimolecular system. Furthermore, some carbon atoms in a fullerene molecule are negatively charged in the bimolecular system. These results suggest the generation of positive holes and conduction electrons in the bimolecular system. Investigation of reports about simulation in an excited state and the actual measurement of electric conductivity has revealed that these positive holes and conduction electrons in the ground state facilitate the migration of positive holes and conduction electrons generated in a photoactive layer by light irradiation.
关键词： The ground state,Semi-double bond,Negative charge,DFT method,Organic solar cell,Photovoltaic mechanisms
更新于2025-09-11 14:15:04
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Synthesis and Characterization of novel Thiophene and Carbazole-based Polymers – Optical and Electrochemical Characterization
摘要： A donor/acceptor series of carbazole copolymers, composed of alternating 2,7-linked 3,6-difluoro-9-(1-octyl-nonyl)-carbazole units and bithiophene repeated units [P1], 5,7-bis(5-bromothiophen-2-yl)-2,3-bis(4-(2-ethylhexyloxy) phenyl) thieno[3,4-b]pyrazine repeated units [P2] and bithiophene mixed with thieno[3,4-b]pyrazine repeated units [P3] have been prepared following Suzuki polymerisation procedures. The route of synthesis and characterisation techniques of this novel class of materials, together with their photo-physical and electrochemical properties are presented in this study. The polymers were characterised by 1H NMR, 13C NMR and Elemental Analysis. Molecular weights were estimated using gel permeation chromatography (GPC). The thermal stability behaviour for polymers was investigated using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The electronic and photo-physical properties were investigated by use of cyclic voltammetry (CV) and UV-Vis spectroscopy, respectively.
关键词： Conjugated polymer,Organic solar cell,Band gap
更新于2025-09-04 15:30:14