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Conjugated Polymer Controlled Morphology and Charge Transport of Small-Molecule Organic Semiconductors
摘要： In this study, we report an effective approach to tune the crystallization, microstructure and charge transport of solution-processed organic semiconductors by blending with a conjugated polymer additive poly(3-hexylthiophene) (P3HT). When 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) was used as a model semiconductor material to mix with different amount of P3HT, their intermolecular interactions led to distinctive TIPS pentacene film morphologies, including randomly-oriented crystal ribbons, elongated needles with enhanced long-range order, and grass-like curved microwires with interlinkages. Each type of morphology was found to further correlate to considerably different charge transport and device performance. As compared to pristine TIPS pentacene devices, bottom-gate, top-contact OTFTs with 2% in weight P3HT additive showed a 2-fold and 5-fold improvement of average field-effect mobility and performance consistency (defined as the ratio of average mobility to the standard deviation), respectively. The improvement in transistor electrical performance can be attributed to the combined effect of enhanced crystal orientation and uniformity, as well as increased areal coverage. This work can be applied beyond the particular example demonstrated in this study and to tune the charge transport of other small-molecule organic semiconductors in general.
关键词： OTFTs,TIPS pentacene,organic semiconductors,film morphology,P3HT,charge transport,conjugated polymer
更新于2025-09-19 17:13:59
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Poly(3a??hexylthiophene)/Gold Nanorod Composites as Efficient Holea??Transporting Materials for Perovskite Solar Cells
摘要： Poly(3-hexylthiophene)/gold nanorod (P3HT/AuNR) composites were developed and introduced as hole-transporting materials (HTMs) to fabricate mixed-ion perovskite solar cells (PSCs). The power conversion efficiency (PCE) of the optimized devices based on the composite HTM reached up to 16.88%, which was an increase of 26% from that of a pristine P3HT-based device (13.40%). The enhanced performance can be attributed to the increased crystallinity of P3HT induced by the addition of AuNRs in the polymer matrix and the localized surface plasmon resonance (LSPR) effect of AuNRs, which lead to higher carrier mobility and increased light utilization efficiency. This work provides a comprehensive understanding of the effect of plasmonic Au nanorods in PSCs application and a useful method to further improve the performance of PSCs.
关键词： gold nanorod,hole-transporting materials,perovskite solar cells,nanocomposite,P3HT
更新于2025-09-19 17:13:59
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[IEEE 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Dhaka, Bangladesh (2019.5.3-2019.5.5)] 2019 1st International Conference on Advances in Science, Engineering and Robotics Technology (ICASERT) - Layer thickness effect on power conversion efficiency of a P <sub/>3</sub> HT:PCBM based organicsolar cell
摘要： In recent years Organic Solar Cells have become a prominent topic of research to achieve an optimum efficiency at low cost. By using the GPVDM software on this paper, we have analyzed the power conversion efficiency, changing simultaneously both the polymers and blending layer thickness of P3HT:PCBM based solar cell. Our main goal is to find which layer change keeps the power conversion efficiency output better. After comparing them, the result shows that setting the active layer (P3HT:PCBM) in an optimum layer thickness and varying the polymer (PEDOT:PSS) gives a better output of PCE. In our paper, from the data in both cases, The highest efficiency is 4.50 percent where P3HT:PCBM thickness is 2.2×10-7 m and PEDOT:PSS layer thickness is 1×10-7 m.
关键词： PEDOT:PSS,Organic solar cell,polymer layer,blending layer,active layer,PCE,P3HT:PCBM
更新于2025-09-16 10:30:52
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Optical simulation and geometrical optimization of P3HT/GaAs nanowire hybrid solar cells for maximal photocurrent generation via enhanced light absorption
摘要： The implications of using the combination of inorganic and organic materials in the active layer of solar cells have motivated researchers to find a new pathway for flexible, low cost, and highly efficient future generation solar cells. III-V material based nanowires (NWs) with subwavelength scale diameters have shown excellent light harvesting and charge transport properties and can be easily combined with organic polymer materials and thin substrates to design hybrid solar cells (HSCs). To obtain optimum design requirements for GaAs nanowire array (NWA) HSCs, an optical simulation of poly(3-hexylthiophene) P3HT/ GaAs (NWA) hybrid solar cell is investigated using finite-difference-time-domain (FDTD) method. In comparison to planar substrate, P3HT coated NWA have shown superior optical properties owing to its intrinsic anti-reflection, broad absorption spectra, and efficient excitation of resonance modes. A steady improvement in light absorption of P3HT/GaAs NWA HSCs is observed as the polymer coating thickness increased up to a certain limit and beyond which there is a significant degradation in the exciton generation. The geometrical parameters like diameter (D) of NW and filling ratio or periodicity are also optimized to achieve superior light absorption and maximum short circuit current density (Jsc). Under AM1.5G illumination, maximum photocurrent obtained for optimized structure with conformal coating of P3HT is almost 12% and 15% higher than its fully infiltrated and uncoated counterparts respectively.
关键词： Hybrid solar cells,FDTD,GaAs NWs,P3HT,Absorption
更新于2025-09-16 10:30:52
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Enhanced efficiency of CdS/P3HT hybrid solar cells via interfacial modification
摘要： The present paper examines the effects of surface modification of CdS with diverse dyes on fabricated CdS-based hybrid solar cells. The X-ray diffraction results showed that CdS thin films had a hexagonal phase with a preferred orientation along the (101) plane. Scanning electron microscopy indicated that the CdS specimen was composed of a granular structure while a P3HT layer was formed from tiny grains. Band gaps of the CdS thin films and the P3HT layer were 2.45 eV and 1.98 eV, respectively. The absorption spectra showed that different dye loading caused an increase in the absorbance of CdS thin films in the wavelength range of 400–650 nm. The photoluminescence of the CdS/P3HT structure including various dyes was lower than that of the pristine one, implying that efficient charge separation was achieved upon surface modification. Current density–voltage curves showed that the ITO/CdS/N719/Ag hybrid solar cell exhibited the best overall efficiency of 0.082%, which can be attributed to improvements in both short circuit current density (J sc) and open circuit voltage (V oc) . These enhancements can be attributed to the creation of better interfacial contact between CdS and P3HT layers after dye loading.
关键词： CdS thin films,hybrid solar cell,dye effect,P3HT,spray pyrolysis
更新于2025-09-16 10:30:52
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Solution-processed P3HT:PbS based NIR Photodetector with FET Configuration
摘要： A near-infrared (NIR) solution-processed photodetector based on a mixture of PbS colloidal quantum dots (CQDs) and Poly(3-hexylthiophene) (P3HT) was presented. In a reverse field-effect transistor (FET) device configuration Au(S,D)/P3HT:PbS/PMMA/Al(G), uniform-sized and well-dispersed PbS CQDs were employed as NIR absorbing materials in the active layer. Meanwhile, the poly(methyl methacrylate) (PMMA) dielectric layer could be seen as an encapsulation to enhance the device stability. Herein, High “on/off” current ratio (Ion/Ioff) of 104 was obtained in dark, and the maximum photosensitivity (P) of 947 was gotten under 200 mW/cm2 980 nm illumination. When the irradiance reduced to 0.1 mW/cm2, the responsivity (R) and detectivity (D?) of the NIR photodetector reached 9.4 mA/W and 2.5×1011 Jones, respectively. Therefore, the P3HT:PbS hybrid FET-based NIR photodetector had shown both relatively high electrical and detecting performance, which provided an experimental foundation and method for the next fabrication of medical infrared detectors and sensors.
关键词： PbS colloidal quantum dots (CQDs),Near-infrared (NIR) photodetector,Poly(3-hexylthiophene) (P3HT),Field-effect transistor (FET)
更新于2025-09-16 10:30:52
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Study of p-type doping effect on P3HT: ICBA based organic photovoltaic solar cell performance
摘要： In this work, we present a simulation study for p-type doping effect on the performance of a photovoltaic organic solar cell based on P3HT: ICBA. Thus, numerical simulations are investigated on ITO/PEDOT: PSS /P3HT: PCBM/Ca/Al structure with AMPS-1D (Analysis of Microelectronic and Photonic Structures the simulation one dimension) software. Indeed, the p-type doping is considered as an original approach for the efficiency improvement of the organic solar cell. However, we noticed that this improvement is only valid for the active layer devices characterized by hole mobility μp less than 1E-3cm2V-1s-1. Furthermore, an efficiency peak of 5.856% is obtained for doping density of 1E17cm-3 corresponding to an improvement of 25.9%. Moreover, the obtained results remain in good agreement with those experimentally reported in literature.
关键词： hole mobility,efficiency,p-type doping,P3HT: ICBA,AMPS-1D,organic solar cell
更新于2025-09-16 10:30:52
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Cost-Effective and Semi-Transparent PbS Quantum Dot Solar Cells Using Copper Electrodes
摘要： PbS quantum dots (QDs) have gained significant attention as promising solution-based materials for third generation of photovoltaic (PV) devices thanks to their size-tunable bandgap, air stability and low-cost solution processing. Gold (Au), despite its high cost, is the standard electrode in the conventional PbS QDs PV architecture due to its perfect alignment with valence levels of PbS QDs. However, to comply with manufacturing requirements for scalable device processing, alternative cost-effective electrodes are urgently required. Here, we employed interface engineering approach and deposited poly(3-hexylthiophene-2,5-diyl) (P3HT) as a hole transport layer on 1,2-Ethanedithiol (EDT)-capped PbS QDs in order to adjust the valence band of QDs with the work function of inexpensive copper (Cu) electrode. In fact, this is the first report of Au-free PbS QDs PV system employing the conventional device structure. Our Cu-based device shows a maximum power conversion efficiency (PCE) of 8.7% which is comparable with that of the Au-based device (10.2 %). Interestingly, the P3HT-based device shows improved stability with relatively 10% PCE loss after 230 h under continuous illumination. Moreover, using ultrathin Cu electrode, a semi-transparent PbS QDs PV is fabricated with a remarkably high average visible transparency (AVT) of 26% and a PCE of 7.4%.
关键词： Semi-transparent,Solar cell,Copper,Cost-effective,P3HT,PbS QDs
更新于2025-09-12 10:27:22
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Effects of oxygen atoms introduced at different positions of non-fullerene acceptors on performance of organic solar cells with poly(3-hexylthiophene)
摘要： With the development of large-area fabrication technologies for organic solar cells (OSCs), poly(3-hexylthiophene) (P3HT) is the best chioce as photovoltaic donor polymer becasue it can be easily synthesized in the scale of kilogram with low cost. However, non-fullerene acceptors (NFAs) matching with P3HT for high performance OSCs are very rare. Herein, by introducing oxygen atoms into the side chains or fused-ring core of indaceno[1,2-b:5,6-b’]dithiophene (IDT), we synthesized two new A2-A1-D-A1-A2 type NFAs, where benzotriazole (BTA) and 2-(1,1-dicyanomethylene)rhodanine (RCN) were used as bridged A1 and terminal A2 respectively. The final NFAs, named as BTA43 and BTA53, show wider absorption spectra and enhanced inter-/intra-molecular interaction in comparison with their analogue BTA3 without oxygen atom. The photovoltaic devices based on P3HT:BTA43 and P3HT:BTA53 can achieve the high PCEs of 6.56% and 6.31% respectively, which are obvious higher than that of BTA3 (5.64%). Our results provide a simple and effective strategy to design promising NFAs to pair with classic photovoltaic polymer P3HT.
关键词： molecular engineering,photovoltaic,non-fullerene acceptors,organic solar cells,P3HT
更新于2025-09-12 10:27:22
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Combined parametric optimization of P3HT: PC70BM films for efficient bulk-heterojunction solar cells
摘要： In this report, the effects of photoactive blend compositions, film thicknesses, and annealing conditions on the P3HT:PC70BM solar cells performance and reproducibility was investigated. The performance of prepared devices was described by examining their absorption spectra, current-voltage characteristics and external quantum efficiency (EQE). The thickness of active layer was achieved as 190 nm, 125 nm, and 90 nm, by maintaining the spin speed. Current density (Jsc) slightly increases from 6.39 to 7.15 mA/cm2 with increase in thickness from 90 to 125 nm; however, with further increase in film thickness (190 nm), the Jsc was reduced to 4.39 mA/cm2. To optimize the device performance, four different compositions of PC70BM (1:0.6, 1:0.8, 1:1, and 1:12) were investigated at the most favorable film thickness ~ 125 nm. The effect of different PC70BM compositions on photovoltaic performance was demonstrated by X-ray diffraction (XRD) and Raman measurements that illuminated modification in structural properties. Additionally, annealing condition led to achieve the good phase separation for efficient charge separation and transport within P3HT: PCBM film which further leads to increased efficiency (PCE ~ 3.31%). These effects deliver valued facts for the choices of PC70BM amount in P3HT:PC70BM system, and this efficient device optimization might be useful in other efficient photovoltaic systems for better performance through excellent reproducibility.
关键词： P3HT:PC70BM,Composition,Film thickness,Solar cells,Photoactive layer
更新于2025-09-12 10:27:22