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Oxoammonium enabled secondary doping of hole transporting material PEDOT:PSS for high-performance organic solar cells
摘要： Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) is one of the most widely used hole transporting materials in organic solar cells (OSCs). Multiple strategies have been adopted to improve the conductivity of PEDOT:PSS, however, effective strategy that can optimize the conductivity, work function, and surface energy simultaneously to reach a better energy alignment and interface contact is rare. Here, we demonstrate that oxoammonium salts (TEMPO+X?) with different counterions can act as facile and novel dopants to realize secondary doping of PEDOT:PSS. The effective charge transfer process achieved between TEMPO+X? and PEDOT:PSS results in enhanced carrier density and improved conductivity of PEDOT:PSS. Moreover, different counterions of TEMPO+X? can tune the work function and surface energy of PEDOT:PSS, enabling improved device performances. The resulting device with PM6:Y6 as the active layer shows a high power conversion efficiency (PCE) over 16%. Moreover, this doping strategy can also be applied to other conjugated polymers such as poly(3-hexylthiophene). This work provides a promising strategy to tune the properties of conjugated polymers through doping, thus effectively boosting the performance of organic solar cells.
关键词： interface modification,multi-functional secondary doping,organic solar cells,oxoammonium,PEDOT:PSS
更新于2025-09-23 15:21:01
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Small bandgap non-fullerene acceptor enables efficient PTB7-Th solar cell with near 0 eV HOMO offset
摘要： Three small bandgap non-fullerene (SBG NFAs) acceptors, BDTI, BDTI-2F and BDTI-4F, based on a carbon-oxygen bridged central core and thieno[3,4-b]thiophene linker, end-capped with varied electron-withdrawing terminal groups, were designed and synthesized. The acceptors exhibit strong absorption from 600 nm to 1000 nm. The optimal device incorporating designed NFA and PTB7-Th polymer donor achieves a power conversion efficiency of 9.11% with near 0 eV HOMO offset. The work presents a case study of efficient non-fullerene solar cells with small HOMO offsets, which is achieved by blending PTB7-Th with fine-tuned SBG acceptor.
关键词： Organic solar cells,Driving force,HOMO offset,Non-fullerene acceptors,Small bandgap
更新于2025-09-23 15:21:01
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Ternary Organic Solar Cells Based on two Non-fullerene Acceptors with Complimentary Absorption and Balanced Crystallinity
摘要： The ternary blend structure has been demonstrated as an effective approach to increase the power conversion efficiency of organic solar cells. An effective approach to enhance the power conversion efficiency of ternary solar cells is based on two non-fullerene acceptors with complimentary absorption range and balanced crystalinity. In this work, by introducing a high crystallinity small-molecule acceptor, named C8IDTT-4Cl with appropriate alkyl side chains into a low crystalline blend of conjugated polymer donor PBDT-TPD and fused-ring electron acceptor ITIC-4F. A ternary device based on the blend PBDT-TPD:ITIC-4F:C8IDTT-4Cl exhibits a best power conversion efficiency of 9.51% with a simultaneous improvement of the short-circuit current density to 18.76 mA cm-2 and the fill factor up to 67.53%. The absorption onset for C8IDTT-4Cl is located at 900 nm, so that the well complementary light absorption is beneficial to the photocurrent. In addition, the existence of high crystallinity C8IDTT-4Cl in the ternary device is found helpful to modulate crystallinity, improve heterojunction morphologies and stacking structure, therefore to realize higher charge mobility and better performance.
关键词： Non-fullerene Acceptors,Ternary Organic Solar Cells,Power Conversion Efficiency,Complimentary Absorption,Balanced Crystallinity
更新于2025-09-23 15:21:01
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Fully doctor-bladed efficient organic solar cells processed under ambient condition
摘要： The low-cost and high-throughout printing techniques are potentially used to process large-area organic solar cells (OSCs). However, high-performance OSCs fabricated via fully printing process have lots of challenges. Herein, OSCs are fabricated via fully doctor blading using subsequently printed electron transport layer (ETL) zinc oxide (ZnO), printed bulk heterojunction (BHJ) active layer composed of poly[(2,6-(4,8-bis(5-(2-ethylhexy)thiophen-2-yl)-benzo[1,2-b:4,5-b’]dithiophene))-alt-(5,5-(1’,3’-di-2-thienyl-5’,7’-bis(2-ethylhexyl)benzo[1’,2’-c:4’5’-c’]dithiophene-4,8-dione))] (PBDB-T) and 3,9-bis(2-methylene-(3-(1,1-dicyano-methylene)-5-methylindanone)-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2’,3’-d’]-s-indaceno[1,2-b:5,6-b’]-dithiophene (IT-M), and printed hole transport layer (HTL) molybdenum oxide (MoO3). Through the optimization of inks and printing parameters， as well as humidity control, OSCs fabricated via printed ETL ZnO in ambient condition and spin-coated BHJ PBDB-T:IT-M in glovebox produce a power conversion efficiency (PCE) of 10.73 %, which is similar to fully spin-coated device. While OSCs fabricated via printed ETL ZnO and BHJ PBDB-T:IT-M in ambient condition can produce a PCE of 10.15 %. Furthermore, the PCE up to 9.34 % can be achieved for fully printed OSCs with doctor-bladed ETL ZnO, BHJ PBDB-T:IT-M and HTL MoO3 in ambient condition. These results suggest that high-performance OSCs can be fabricated using printing techniques in ambient condition instead of spin-coating and inert atmosphere, exhibiting great potential to accelerate the commercialization of OSCs.
关键词： ambient condition,fully printing,organic solar cells,doctor blading
更新于2025-09-23 15:21:01
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Semi-Transparent Organic Solar Cells Enabled by Sequentially Deposited Bilayer Structure
摘要： Semi-transparent organic solar cells (ST-OSCs) have been regarded as a promising candidate for building integrated photovoltaics (BIPV). In general, most of the ST-OSCs are based on bulk heterojunction (BHJ) structure, in which, the morphology of BHJ film must be delicately optimized. In this work, we introduce sequentially deposited bilayer structure into ST-OSCs by using PTB7-Th:IEICO-4F combination. The adoption of bilayer structure not only simplifies the device optimization, it is also found that, as donor and acceptor are separately deposited, the power conversion efficiency (PCE) of bilayer ST-OSCs can be improved by simply increasing the thickness of IEICO-4F, which has strong near infrared absorption but weak visible light absorption, without significantly affecting the average visible light transmittance (AVT) of device. However, in BHJ structure, the increase in BHJ film thickness unavoidably enhances the donor absorption in visible light region, leading to a tradeoff between PCE and AVT in BHJ structure ST-OSCs. Eventually, the bilayer structure device exhibits better overall performance than BHJ structure device, e.g. PCE of 8.5% for bilayer structure vs PCE of 8.1% for BHJ structure with AVT around 21%. Our findings indicate that the sequentially deposited bilayer structure, aside from its easy processing characteristic, also has great potential for preparing high performance ST-OSCs.
关键词： simplified processing,increased infrared absorption,organic solar cells,bilayer structure,semi-transparent
更新于2025-09-23 15:21:01
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Fluorinating ??a??Extended Molecular Acceptors Yields Highly Connected Crystal Structures and Low Reorganization Energies for Efficient Solar Cells
摘要： The synthesis and characterization of new semiconducting materials is essential for developing high-efficiency organic solar cells. Here, the synthesis, physiochemical properties, thin film morphology, and photovoltaic response of ITN-F4 and ITzN-F4, the first indacenodithienothiophene nonfullerene acceptors that combine π-extension and fluorination, are reported. The neat acceptors and bulk-heterojunction blend films with fluorinated donor polymer poly{[4,8-bis[5-(2-ethylhexyl)-4-fluoro-2-thienyl]benzo[1,2-b:4,5-b′]-dithiophene-2,6-diyl]-alt-[2,5-thiophenediyl[5,7-bis(2-ethylhexyl)-4,8-dioxo-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-1,3-diyl]]} (PBDB-TF, also known as PM6) are investigated using a battery of techniques, including single crystal X-ray diffraction, fs transient absorption spectroscopy (fsTA), photovoltaic response, space-charge-limited current transport, impedance spectroscopy, grazing incidence wide angle X-ray scattering, and density functional theory level computation. ITN-F4 and ITzN-F4 are found to provide power conversion efficiencies greater and internal reorganization energies less than their non-π-extended and non-fluorinated counterparts when paired with PBDB-TF. Additionally, ITN-F4 and ITzN-F4 exhibit favorable bulk-heterojunction relevant single crystal packing architectures. fsTA reveals that both ITN-F4 and ITzN-F4 undergo ultrafast hole transfer (<300 fs) in films with PBDB-TF, despite excimer state formation in both the neat and blend films. Taken together and in comparison to related structures, these results demonstrate that combined fluorination and π-extension synergistically promote crystallographic π-face-to-face packing, increase crystallinity, reduce internal reorganization energies, increase interplanar π–π electronic coupling, and increase power conversion efficiency.
关键词： impedance spectroscopy,organic solar cells,crystal structures,femtosecond transient absorption spectroscopy,computational chemistry
更新于2025-09-23 15:21:01
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Non-fullerene small molecule acceptors with three-dimensional thiophene/selenophene-annulated perylene diimides for efficient organic solar cells
摘要： Three-dimensional non-fullerene acceptors with a spiro core linked with S/Se fused perylene diimides possess appropriate energy levels, twisted molecular configuration and high carrier mobility, leading to a power conversion efficiency of 6.95% for the organic solar cells.
关键词： perylene diimides,organic solar cells,carrier mobility,non-fullerene acceptors,spiro core
更新于2025-09-23 15:21:01
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Microwave-assisted synthesis of ZnO nanostructures for organic solar cell applications
摘要： In this work, a simple and efficient microwave-assisted hydrothermal method was adopted to synthesis zinc oxide nanostructures. Zinc acetate and hexamethylenetetramine were used as precursors. Various parameters involving synthesis conditions were attuned in order to achieve well-defined morphology. XRD peaks indicated the high crystallinity and hexagonal wurtzite structure of the prepared material. Field emission scanning electron microscopy revealed different morphology of the synthesized material. The prepared material can be used in organic solar cells, for effective dissociation of electron-hole pairs and thus enhancing photovoltaic performance.
关键词： Morphology,Organic solar cells,Microwave,Nanostructures,ZnO
更新于2025-09-23 15:21:01
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Organic solar cells probed with advanced neutron scattering techniques
摘要： Neutron scattering techniques provide unique insights into the active layer morphology of organic solar cells. The nanoscale morphology, the thin film vertical composition, and the intermixing on a molecular level, which all strongly have an impact on the performance of organic solar cells, can be probed with neutrons. In addition to the static structure, also fast dynamics occurring in the active material is accessible with neutrons. This perspective letter highlights the power of grazing incidence small angle neutron scattering and quasi-elastic neutron scattering experiments after shortly introducing into the working principle of organic solar cells.
关键词： neutron scattering,grazing incidence small angle neutron scattering,morphology,quasi-elastic neutron scattering,organic solar cells
更新于2025-09-23 15:21:01
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An Acceptor-Donor-Acceptor Type Non-Fullerene Acceptor with Asymmetric Backbone for High Performance Organic Solar Cells
摘要： An A-D-A type acceptor CC10 with the asymmetric D unit has been designed and synthesized through introducing an alkylbenzene into a symmetric acceptor CC5. Compared with the symmetric CC5, the asymmetric CC10 showed similar absorption range and energy level, but better π-π stacking, enhanced electron mobility and optimized microscopic morphology. As a result, the CC10-based organic solar cells demonstrated a high PCE of 11.78%, better than that of 6.91% for CC5-based device. The significantly improved device performance casued only by minor modification in molecular backbone indicates that there is substantial potential of asymmetric strategy for design high performance active layer materials.
关键词： Non-Fullerene Acceptor,Organic solar cells,Asymmetric Backbone,High Performance
更新于2025-09-23 15:21:01