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Higha??Efficiency CsPbI <sub/>2</sub> Br Perovskite Solar Cells with Dopanta??Free Poly(3a??hexylthiophene) Hole Transporting Layers
摘要： CsPbI2Br is emerging as a promising all-inorganic material for perovskite solar cells (PSCs) due to its more stable lattice structure and moisture resistance compared to CsPbI3, although its device performance is still much behind this counterpart. Herein, a preannealing process is developed and systematically investigated to achieve high-quality CsPbI2Br films by regulating the nucleation and crystallization of perovskite. The preannealing temperature and time are specifically optimized for a dopant-free poly(3-hexylthiophene) (P3HT)-based device to target dopant-induced drastic performance degradation for spiro-OMeTAD-based devices. The resulting P3HT-based device exhibits comparable power conversion efficiency (PCE) to spiro-OMeTAD-based devices but much enhanced ambient stability with over 95% PCE after 1300 h. A diphenylamine derivative is introduced as a buffer layer to improve the energy-level mismatch between CsPbI2Br and P3HT. A record-high PCE of 15.50% for dopant-free P3HT-based CsPbI2Br PSCs is achieved by alleviating the open-circuit voltage loss with the buffer layer. These results demonstrate that the preannealing processing together with a suitable buffer layer are applicable strategies for developing dopant-free P3HT PSCs with high efficiency and stability.
关键词： perovskite solar cells,inorganic perovskites,P3HT
更新于2025-09-23 15:19:57
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Improved stability in <scp>P3HT</scp> : <scp>PCBM</scp> photovoltaics by incorporation of <scp>wella??designed</scp> polythiophene/graphene compositions
摘要： Morphological and photovoltaic stabilities of poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PC71BM) solar cells were investigated in pristine and modified states. To this end, the four types of patterned/assembled nanostructures, such as reduced graphene oxide (rGO)-g-poly(3-dodecylthiophene) (PDDT)/P3HT patched-like pattern, rGO-polythiophene (GPTh)/P3HT/PC71BM nanofiber, rGO-g-P3HT/P3HT cake-like pattern and supra(polyaniline (PANI)-g-rGO/P3HT) were designed on the basis of rGO and different conjugated polymers. Intermediately covered rGO nanosheets by the P3HT crystals (supra(PANI-g-rGO/P3HT)) acted better than rarely (patched-like pattern) and fully (cake-like pattern) covered ones in P3HT:PC71BM solar systems. Supra(PANI-g-rGO/P3HT) nano-hybrids largely phase separated in active layers (root mean square = 0.88 nm) and also reflected the highest performance (PCE = 5.74%). The photovoltaic characteristics demonstrated the plummeting trends during the air aging for all sorts of devices, but with distinct slopes. The steepest decreasing plots were obtained for the unmodified P3HT:PC71BM devices (from 1.77 to 0.28%). The two last supramolecules with the most ordered structures, i.e., cake-like pattern (10.12 mA/cm2, 51%, 0.58 V, 2.2 × 10–6 cm2/V.s, 4.3 × 10–5 cm2/V.s, 0.69 nm and 2.99%) and supra(PANI-g-rGO/P3HT) (12.51 mA/cm2, 57%, 0.63 V, 1.2 × 10–5 cm2/V.s, 3.4 × 10–4 cm2/V.s, 0.82 nm and 4.49%), highly retained the morphological and photovoltaic stabilities in P3HT:PC71BM devices after 1 month air aging. According to the morphological, optical, photovoltaic and electrochemical results, the supra(PANI-g-rGO/P3HT) nano-hybrids were the best candidates for stabilizing the P3HT:PC71BM solar cells.
关键词： Stability,air aging,P3HT,supramolecule,PC71BM
更新于2025-09-23 15:19:57
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Structure and Conformation of a Crystalline P3HT Film Adsorbed on an Alkanethiol Self-Assembled Monolayer Deposited on Gold
摘要： All-atom molecular dynamics simulations are performed to investigate the structural and conformational properties of a regioregular poly(3-hexylthiophene) (P3HT) crystal in the presence of a gold (Au) substrate terminated with an n-alkanethiol self-assembled monolayer (SAM). The employed orientation of the P3HT crystals deposited on the SAM is the edge-on, since this orientation is believed to be the most energetically favorable and stable, also yielding the highest charge carrier mobility in organic thin-film transistors. The unit cell of the overall Au/SAM interfacial layer is obtained through detailed ab initio calculations. Systems with a varying number of P3HT stacks on the Au/SAM substrate are studied with an all-atom force field in order to elucidate the effect of polymer thickness on the structural properties of the system. All final structures are found to be stable and well-equilibrated. Insights into the P3HT crystal structure are provided for the P3HT layers in direct contact with the SAM, but also for those deeper in the polymer film. According to the simulations, the majority of conformational and packing properties of the P3HT film are practically similar to those of the bulk crystalline P3HT material, implying that its structure remains unaffected by the presence of the underlying Au/SAM substrate.
关键词： DFT calculations,semiconducting polymers,molecular dynamics simulations,self-assembled monolayers,P3HT
更新于2025-09-23 15:19:57
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Selfa??Powered Flexible TiO <sub/>2</sub> Fibrous Photodetectors: Heterojunction with P3HT and Boosted Responsivity and Selectivity by Au Nanoparticles
摘要： A novel inorganic–organic heterojunction (TiO2/P3HT (poly(3-hexylthiophene)) is easily prepared by a combination of anodization and vacuumed dip-coating methods, and the constructed flexible fibrous photodetector (FPD) exhibits high-performance self-powered UV–visible broadband photoresponse with fast speed, high responsivity, and good stability, as well as highly stable performance at bending states, showing great potential for wearable electronic devices. Moreover, Au nanoparticles are deposited to further boost the responsivity and selectivity by regulating the sputtering intervals. The optimal Au/TiO2/P3HT FPD yields an ≈700% responsivity enhancement at 0 V under 350 nm illumination. The sharp cut-off edge and high UV–visible rejection ratio (≈17 times higher) indicate a self-powered flexible UV photodetector. This work provides an effective and versatile route to modulate the photoelectric performance of flexible electronic devices.
关键词： TiO2/P3HT heterojunctions,Au nanoparticles,fiber photodetectors,flexible devices,self-powered
更新于2025-09-23 15:19:57
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MoS <sub/>2</sub> Assisted Self-Assembled Poly (3-hexylthiophene) Thin Films at Air/Liquid Interface for High-Performance Field-Effect Transistors under Ambient Condition
摘要： It is a key challenge to achieve long-range ordering in nanoscale morphology of π-conjugated polymers for efficient charge transport in organic electronic devices. The long-range ordering and aggregation in poly (3-hexylthiophene) (P3HT) has been accomplished by introducing two dimensional (2D) Molybdenum disulfide (MoS2) nanosheets in polymer matrix followed by ultrasonication in chloroform. Thin films of synthesized P3HT/MoS2 nanocomposites having various fractions of MoS2 in the P3HT matrix have been fabricated on the air/liquid interface. The UV visible absorption spectroscopy has been employed to investigate the nature of aggregation and exciton bandwidth in the resultant films deposited at the air/liquid interface. Moreover, grazing incidence X-ray diffraction (GIXD) analysis, and atomic force microscopy (AFM), reveal the long-range ordering and highly crystalline thin films with the edge-on orientation of polymer chains over the substrate. Further, the impact of aggregation, morphology, and orientation on macroscopic charge transport performance is elaborately estimated by fabricating organic field-effect transistors (OFETs). The hole mobility as high as 0.160 ± 0.007 cm2V-1s-1, has been achieved for P3HT/MoS2 (1%) nanocomposite under ambient condition.
关键词： organic field-effect transistors,MoS2,π-conjugated polymers,nanocomposites,P3HT,charge transport
更新于2025-09-23 15:19:57
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Solution-processed organic field-effect transistors with cross-linked poly(4-vinylphenol)/polyvinyl alcohol bilayer dielectrics
摘要： A single-layer gate dielectric cannot meet the requirements of large permittivity (k) and low surface polarity for fabricating low-operating-voltage, high-performance OFETs. Here, we have designed a bilayer gate dielectric consisting of a low-k cross-linked poly(4-vinylphenol) (CL-PVP) in contact with an active layer to provide a low polar surface and an underneath high-k polyvinyl alcohol (PVA) layer to ensure a high capacitance. The results show that the CL-PVP/PVA bilayer not only offers a smooth and uniform surface with low polarity and low surface energy as well as good solvent resistance for efficient carrier transport, but also possesses a relatively high capacitance and low leakage current for low threshold and operating voltages. We have utilized this bilayer dielectric to fabricate OFETs based on a conventional semiconducting polymer poly(3-hexylthiophene) (P3HT). High overall device performances have been achieved in the devices with a mobility of 0.1 cm2V-1s-1. The maximum density of trap states at the interface between the P3HT film and the CL-PVP/PVA bilayer is estimated to be 7.10×1012 cm-2 eV-1, further proving that this bilayer dielectric provides a high quality interface for P3HT. The CL-PVP/PVA bilayer is thus a promising candidate as a gate dielectric for fabricating high-performance organic or even organic-inorganic hybrid perovskite transistors by a solution processing technique.
关键词： P3HT OFETs,gate dielectrics,low-k CL-PVP/high-k PVA bilayer,dielectric and surface properties
更新于2025-09-19 17:15:36
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Enhanced solar cell performance of P3HT:PCBM by SnS nanoparticles
摘要： In this research, un- and zinc (Zn)-doped tin sulfide (SnS) nanoparticles (NPs) were synthesized by ultrasound method and added to the active layer of ITO/PEDOT:PSS/P3HT: PCBM/Al polymer solar cells (PSCs). The structural, optical, and electrical properties due to the influence of NPs on solar cell performance were investigated. The X-ray diffraction (XRD) patterns of the NPs indicates the formation of orthorhombic polycrystalline SnS. Field emission scanning electron microscopy (FESEM) images show spherical particles with size less than 100 nm for un- and Zn-doped SnS samples. Optical analysis of the cells shows a decrease in the band gap due to the presence of un- and Zn-doped SnS NPs. Photovoltaic characterization of the samples shows that by adding NPs to the polymer film, the device performance improves significantly compared to the absence of NPs. The presence of NPs with different concentrations and structural defects affects the electro-optical properties of the samples.
关键词： P3HT:PCBM,Polymer solar cells,Tin sulfide nanoparticles,Physical properties
更新于2025-09-19 17:13:59
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Core-Double Shell Nano-hybrids Designed by Multi-walled Carbon Nanotubes, Polyaniline and Polythiophenes in PBDT-DTNT:PC61BM Solar Cells
摘要： Core–mantle–shell supramolecules composed of carbon nanotube (CNT)-graft-polyaniline (PANI), poly(3-hexylthiophene) (P3HT), and poly[benzodithiophene-bis(decyltetradecyl-thien) naphthothiadiazole] (PBDT-DTNT) precursors were designed and utilized in PBDT-DTNT:phenyl-C61-butyric acid methyl ester (PC61BM) solar cells. Weight ratio of polymer:CNT-graft-PANI was 9:1 and the weight ratios were 1:1 in binary and 1:1:1 in ternary systems. Diameters of core(CNT)–mantle(PANI), core(CNT)–mantle(PANI)–shell(P3HT), and core(CNT)–mantle(PANI)–shell(PBDT-DTNT) nanostructures ranged in 75–90 nm, 145–160 nm, and 120–130 nm, respectively. Efficacies of 6.82% (13.92 mA/cm2, 0.71 V, 69%, 7.1 9 10?3 cm2/V s and 1.9 9 10?2 cm2/V s) and 7.60% (14.66 mA/cm2, 0.73 V, 71%, 9.0 9 10?3 cm2/V s and 3.4 9 10?2 cm2/V s) were acquired for photovoltaics based on the nanostructures having PBDT-DTNT and P3HT shells, respectively. The PANI mantle may act as both acceptor (accepting the electrons from core) and donor (donating the electrons to shell) in the configuration of core–mantle–shell supramolecules. The P3HT shells acted better than the PBDT-DTNT ones, originated from the simple structure of P3HT backbones and their more ordered and thicker shells, and thus had larger charge mobilities and currents.
关键词： core–mantle–shell,photovoltaic device,PANI,PBDT-DTNT,P3HT
更新于2025-09-19 17:13:59
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Design of a Broadband Coplanar Waveguide-Fed Antenna Incorporating Organic Solar Cells with 100% Insolation for Ku Band Satellite Communication
摘要： A broadband coplanar waveguide (CPW)-fed monopole antenna based on conventional CPW-fed integration with an organic solar cell (OSC) of 100% insolation is suggested for Ku band satellite communication. The proposed configuration was designed to allow for 100% insolation of the OSC, thereby improving the performance of the antenna. The device structure was fabricated using a Leiterplatten-Kopierfrasen (LPKF) prototyping Printed circuit board (PCB) machine, while a vector network analyzer was utilized to measure the return loss. The simulated results demonstrated that the proposed antenna was able to cover an interesting operating frequency band from 11.7 to 12.22 GHz, which is in compliance with the International Telecommunication Union (ITU). Consequently, a 3 GHz broadband in the Ku band was achieved, along with an enhancement in the realized gain of about 6.30 dB. The simulation and experimental results showed good agreement, whereby the proposed structure could be specifically useful for fixed-satellite-services (FSS) operating over the frequency range from the 11.7 to 12.22 GHz (downlink) band.
关键词： CPW-fed monopole antenna,satellite communication,P3HT:PCBM,organic solar cell
更新于2025-09-19 17:13:59
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Investigation of performance of P3HT:PCBM organic photovoltaic module under real operating conditions
摘要： In this work the behavior of an organic solar module operating under real solar radiation conditions is presented. This allows to understand which parameters limit the e?ciency of an organic device and their underlying mechanisms. The characterization of a module, produced by CSEM Brasil, with active layer P3HT:PCBM, is based on instantaneous voltage and current curves, dark current curves and analysis of the module operating continuously with ?xed voltage. This allows to extract the parameters of the equivalent circuit of the module, such as diode saturation current (I0), series resistance (RS) and shunt resistance (RSH) as well as to understand the in?uence of di?erent levels of radiation and temperature on such parameters. The work presented was performed by using a commercial organic solar module in extensive outdoor experiments. The results are based on continuous use and for several levels of radiation and temperature under real operating conditions in comparison with a theoretical model for the ?rst time. With the continuous tests it was possible to demonstrate the average daily generation of the module in Wh/m2, and also to verify experimentally, that the module presents better e?ciency for di?use radiation.
关键词： Organic solar module,Real operating conditions,P3HT:PCBM,Performance characterization,Photovoltaic
更新于2025-09-19 17:13:59