- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Recent progress in quantum dot-sensitized solar cells employing metal chalcogenides
摘要： As one of the most promising third-generation photovoltaics devices, quantum dot-sensitized solar cells (QDSCs) have attracted increasing attention due to their easy fabrication, low cost, potential high efficiency, etc. Thus, substantial efforts have been taken to boost their photoelectrical conversion efficiencies (PCEs) and device stability consistently by precisely optimizing the structure of materials and device architecture. Throughout the development of QDSCs, it is noteworthy to mention that metal chalcogenide-based semiconductors have been key materials in capturing sunlight as sensitizers, catalytic electrolyte reduction as counter electrodes (CEs), and interface charge transport as interface modification layers. Herein, we systematically review the recent progress on metal chalcogenide-based QDSCs in practical applications from three main functional points, specifically, QD sensitizers, counter electrodes (CEs), and interface modification layers. Besides, we have outlined the fundamental structure, operation principle, and brief history of these sensitized solar cells. Finally, the state of existing challenges and future prospects for QDSCs employing various metal chalcogenides are also discussed.
关键词： interface modification layers,photoelectrical conversion efficiencies,sensitizers,counter electrodes,quantum dot-sensitized solar cells,metal chalcogenides
更新于2025-09-16 10:30:52
-
Solar cells sensitized by porphyrin dyes containing a substituted carbazole donor with synergistically extended absorption and suppressed the dye aggregation
摘要： To achieve high power conversion efficiencies (PCEs), three porphyrin sensitizers have been synthesized and explored to simultaneously enhance the photocurrent (Jsc) and photovoltage (Voc). On basis of the XW4, a benzothiadiazole (BTD) unit has been introduced to afford XW57 with the aim to extend the absorption wavelength and enhance the light harvesting ability. As a result, a Jsc of 13.72 mA/cm2 has been obtained for XW57, higher than that of XW4. On this basis, XW58 has been prepared by modifying the carbazole-based donor with two bulky dihexyloxyphenyl groups, and the superior anti-aggregation character raises the Voc from 781 mV (XW4) to 844 mV. When both the BTD unit and the bulky groups are introduced to the acceptor and donor units, respectively, the resulting sensitizer XW59 exhibits a highest PCE value of 7.34% with synergistically enhanced Jsc of 13.19 mA/cm2 and Voc of 793 mV. These results provide further insight into developing high performance dye-sensitized solar cells.
关键词： Sensitizers,Bulky groups,Porphyrin,Carbazole,Dye-sensitized solar cells
更新于2025-09-16 10:30:52
-
Synthesis and characterization of novel tetra anchoring A2-D-D-D-A2 architecture sensitizers for efficient dye-sensitized solar cells
摘要： Novel metal free organic dyes coded TET(RA)4, TET(CA)4, and TET(QA)4 were designed, synthesized, and characterized as effective sensitizers for dye sensitized solar cells (DSSCs). These new push-pull sensitizers used a strong electron donor consisting of 3,4-ethylenedioxythiophene and two triphenylamine molecules connected together to form a TPA-EDOT-TPA (TET) motif, which is directly connected to tetra anchoring groups (A) without any π-spacers to construct A2-D-D-D-A2 architecture, three different anchoring series, viz. rhodanine-3-acetic acid (RA), cyanoacetic acid (CA), and 2-methyl quinoline-6-carboxylic acid (QA) were employed to investigate the influence of anchoring moieties on the electrochemical, thermodynamic, kinetics, and photovoltaic efficiency of DSSCs. The DSSCs devices showed a maximum overall power conversion efficiency (PCE) = 5.13%, short-circuit current density (JSC) = 12.71 mA.cm?2, open circuit voltage (VOC) = 0.62 V, and fill factor (FF) = 65.36% with a maximum incident photon conversion efficiency (IPCE) = 75% for TET(QA)4. The optical and electrochemical studies showed that TET(QC)4 achieved higher electron injection free energy (ΔG°inj) into CB edge of TiO2 as well as high recombination resistance (Rrec) compared to TET(RA)4, and TET(CA)4, which explains the outstanding charge separation and superior power conversion efficiency (PCE) of TET(QC)4 possessing quinoline-6-carboxylic acid (QC) anchoring group. Molecular modeling calculations using DFT and TD-DFT showed effective charge separation, where HOMO is delocalized over the donor scaffold (TPA-EDOT-TPA), and the LUMO is delocalized over only two anchoring groups on the same side of the donor system, which provides strong HOMO-LUMO overlap as well as intimate electronic coupling with TiO2 nanoparticle surface for electron injection. Further, the calculated values of the energy gaps (E0-0) and ground/excited stated oxidation potentials were in perfect agreement with the experimental results.
关键词： Sensitizers,Molecular modeling,Photovoltaics,Synthesis,Energy conversion
更新于2025-09-16 10:30:52
-
Enhancing Charge Transfer and Photoelectric Characteristics for Organic Solar Cells
摘要： The main purpose of this work is to analyze the effect of steric hindrance on the photoelectric performance of three different donor sensitizers (ZHG5, ZHG6, and ZHG7) by molecular theory simulation engineering. Photoelectric physical and photoelectric chemical parameters are investigated by means of frontier molecular orbital, global reactivity descriptors, optical absorption properties, fluorescent lifetime, charge density difference, and influence of external electric field. The results showed that the performance of the quinoxaline sensitizer was deteriorated by gradually increasing the steric hindrance to auxiliary donors. The optical properties of the hybridization of cir-coronene graphene quantum dot (GR) with the three dyes have been revealed, and the results show that graphene quantum dots can indeed improve the optical properties of solar cells. In addition, nine new molecules were designed by inserting six functional groups; it is found that inserting -CN in the acceptor part of the molecular structure is beneficial to the performance of the sensitizer.
关键词： donor sensitizers,steric hindrance,functional groups,graphene quantum dot,photoelectric performance,molecular theory simulation
更新于2025-09-16 10:30:52
-
Study of some sensitizers for gel polymer electrolyte based sensitized solar cells (SSCs)
摘要： The performance of phthaloychitosan gel polymer electrolyte (GPE) based sensitized solar cells (SSCs) fabricated with different types of sensitizer have been studied in this work. Five types of sensitizer were used viz., curcumin, chlorophyll, (E)-4-hydroxyl-3-((4-iodophenyl)diazenyl)-2H-chromen-2-one (CAD5), (E)-4-hydroxyl-3-((4-methoxyphenyl) diazenyl)-2H-chromen-2-one (CAD7) and cadmium sulphide (CdS). These sensitizers were designated as S1, S2, S3, S4 and S5 respectively. The performance of the sensitized solar cells (SSCs) has been characterized and the experimental results showed that S1 (SSC fabricated with curcumin dye sensitizer) exhibits the best performance with short circuit current density (Jsc) of 3.18 mA cm-2, open circuit voltage (Voc) of 0.41 V, fill factor (FF) 0.57 and power conversion efficiency (PCE) of 0.73%.
关键词： Gel polymer electrolyte,Electrochemical impedance spectroscopy,Sensitizers,Sensitized solar cells
更新于2025-09-12 10:27:22
-
Diketopyrrolopyrrole/perylene-diimide and thiophene based D-π-A low bandgap polymer sensitizers for application in dye sensitized solar cells
摘要： In this study, diketopyrrolopyrrole-alt-thiophene (P1 and P2) and perylene-diimide-alt-thiophene (P3 and P4) based donor-π-acceptor (D-π-A) copolymers have been synthesized from the corresponding monomers through Pd-catalyzed Sonogashira polymerization protocol. The well defined and soluble π-conjugated copolymers having alkyl and fluoroalkyl substituents (P1-P4) have been characterized by multinuclear NMR spectra as well as by tetradetector GPC studies showing molecular weight (Mn) in the range of 18-20 kDa with good polydispersity indices of 1.31-1.48. The donor-acceptor based copolymers absorb broadly throughout the visible region. Notably, perylene diimide-thiophene based copolymers (P3 and P4) exhibits an absorption onset at ca. 800 nm corresponding to a bandgap of 1.63 and 1.61 eV (Egopt). DFT computational studies of the model π-conjugated units have also been investigated to understand the molecular geometries and electronic properties of the polymeric unit. The synthesized D-π-A polymers have been utilized as active materials for polymer-sensitized solar cells (PSSCs). The copolymers are effectively adsorbed onto the surface of nanostructured TiO2 photoanode as a result of facile interaction of the anchored -C=O units with the metal oxide surface. The spectral profile of the polymer films on mesoporous oxide surface approximately similar to the solution absorption spectra of the polymer. Interestingly, the polymers featuring perylene diimide unit (P3 and P4) exhibit promising power conversion efficiency (PCE) of 2.71 and 2.96% with a short circuit current (JSC) of 7.54 and 7.85 mA·cm-2 respectively, and IPCE of 42-45% under 1.5 AM illumination.
关键词： Dye Sensitized Solar Cells,Polymer Sensitizers,Thiophene,Perylene-diimide,Diketopyrrolopyrrole,Low Bandgap,D-π-A
更新于2025-09-12 10:27:22
-
Potential of plant‐based photosensitizers in dye‐sensitized solar cell applications
摘要： In this work, the performance of dye-sensitized solar cells (DSSCs) has been investigated using the extracts from Murraya koenigii, Plectranthus amboinicus, and Coriandrum sativum. The DSSCs were assembled with the extracts, titanium dioxide as the working electrode, iodide/tri-iodide (I3?/I?) as redox couple, and platinum as the counter electrode and their photovoltaic performances were compared. The crude chlorophyll photosensitizer extracted from Plectranthus amboinicus exhibited an open-circuit voltage (VOC) of 637 mV, a short-circuit current density of 0.99 mA/cm2, a fill factor of 0.63, and an energy conversion efficiency of 0.46%. The present results were much higher than the previously reported results by our group.
关键词： photo-sensitizers,fabrication,chlorophyll,clean energy,natural dyes,solar cells
更新于2025-09-11 14:15:04
-
Molecular Engineering of Simple Metal‐Free Organic Dyes Derived from Triphenylamine for Dye‐Sensitized Solar Cell Applications
摘要： Two new metal-free organic sensitizers, L156 and L224, were designed, synthesized, and characterized for application in dye-sensitized solar cells (DSCs). The structures of the dyes contain a triphenylamine (TPA) segment and 4-(benzo[c][1,2,5]thiadiazol-4-yl)benzoic acid as electron-rich and -deficient moieties, respectively. Two different π bridges, thiophene and 4,8-bis(4-hexylphenyl)benzo[1,2-b:4,5-b’]dithiophene, were used for L156 and L224, respectively. The influence of iodide/triiodide, [Co(bpy)3]2+/3+ (bpy = 2,2’-bipyridine), and [Cu(tmby)2]2+/+ (tmby = 4,4’,6,6’-tetramethyl-2,2’-bipyridine) complexes as redox electrolytes and 18 NR-T and 30 NR-D transparent TiO2 films on the DSC device performance was investigated. The L156-based DSC with [Cu(tmby)2]2+/+ complexes as the redox electrolyte resulted in the best performance of 9.26 % and a remarkably high open-circuit voltage value of 1.1 V (1.096 V), with a short-circuit current of 12.2 mA cm?2 and a fill factor of 0.692, by using 30 NR-D TiO2 films. An efficiency of up to 21.9 % was achieved under a 1000 lx indoor light source, which proved that dye L156 was also an excellent candidate for indoor applications. The maximal monochromatic incident-photon-to-current conversion efficiency of L156–30 NR-D reached up to 70 %.
关键词： electrochemistry,donor–acceptor systems,dyes/pigments,sensitizers,solar cells
更新于2025-09-11 14:15:04
-
Novel indeno[1,2-b]indole-spirofluorene donor block for efficient sensitizers in dye-sensitized solar cells
摘要： Indeno[1,2-b]indole-spirofluorene (IISF) unit has been synthesized and firstly applied as a donor candidate for the sensitizer of dye-sensitized solar cells. Two new dyes JY57 and JY58, based on IISF donor, are consequently constructed, together with dithieno[3,2-b:2',3'-d]pyrrole (DTP) as π-bridge and cyanoacrylic acid as acceptor. For JY58, additional electron-withdrawing 2,1,3-benzothiadiazole unit is inserted between IISF donor and DTP π-bridge to achieve a broader absorption range. Both dyes show high JSC and good device performance in iodine electrolyte. The photovoltaic properties are further tuned by co-adsorption and co-sensitization strategies, and better PCEs are obtained. Among the series of cells under AM 1.5G irradiation, cells fabricated by the synergic adsorption of JY57, chenodeoxycholic acid and JY59, achieve the highest PCE of 9.56%, which is much higher than 8.46% for N719 at the same condition.
关键词： Metal-free organic sensitizers,Synergy of co-sensitization and co-adsorption,Dye sensitized solar cells,Indeno[1,2-b]indole-spirofluorene donor
更新于2025-09-11 14:15:04
-
Optoelectrical characterization of different fabricated donor substituted benzothiazole based sensitizers for efficient DSSCs
摘要： In the present work, we have synthesized three novel organic sensitizers, based on various donor groups which are in conjugation with similar bridge and acceptor moieties. We have studied the effect of donor groups with common bridge and anchoring group sensitizers on optical, electrochemical, dye sensitized solar cell’s performance and electron transfer interface properties as well. We have also represented systematically analysis of influence of donor groups in structural geometry, energy distribution and energy-transfer from HOMO to LUMO by density functional theory. The B2 sensitizer contains highly conjugated, strong electron withdrawing group and electron transfer form donor group to anchoring group happens much more rapid in it compared to other two sensitizers. However, B2 sensitizer has exhibited 6.23% efficiency under 1 sun light illumination. The influence of donor groups on device performance was clearly shown on IPCE spectrum as well. The studied effect of chenodeoxycholic acid (CDCA) in a sensitizer’s solution as a co-absorbent on the DSSCs performance and exhibited highest efficiency (6.68 %). We found that co-absorbent can be hinder the sensitizer aggregation and rise electron injection yield and thus short circuit current (Jsc). The device interface kinetics was studied by electrochemical impedance spectroscopy and calculated electron lifetime, interface charge transfer resistance and recombination resistance by fitted equivalent circuit. Moreover, we have checked high performance device stability up to 700 hr, under continuous 1 sun light illumination.
关键词： Sensitizers,Metal-free dye,Benzothiadiazole,Influence of donors,Dye-sensitized solar cells (DSSCs)
更新于2025-09-09 09:28:46