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AIP Conference Proceedings [AIP Publishing 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Fes, Morocco (25–27 March 2019)] 15th International Conference on Concentrator Photovoltaic Systems (CPV-15) - Towards all screen printed back-contact back-junction silicon solar cells
摘要： We report recent progress in the adoption of an optimized screen-printable boron dopant material, which enables the cost-competitive fabrication of novel n-type silicon solar cells such as “nPERT” and “IBC” cells. We manufactured first “IBC” devices with an early version of our dopant material, a co-diffusion approach and evaporated electrodes, achieving an efficiency of 20.9 % in 2016. Since then we optimized the dopant material and co-diffusion processes, as reported in this work. These optimizations now enable a long-term printing of the dopant material, suited for mass production, while maintaining crucial performance parameters. Moreover, we demonstrate a co-diffusion setup with POCl3, which does not require any additional dopant sources and can instead be adjusted with a wet chemical etch back. Combined with new commercially available electrode pastes, which have been evaluated with regard to simultaneous contacting of n- and p-type dopings, all screen printed n-type solar cells become a mass market possibility in the near future.
关键词： screen-printable boron dopant material,co-diffusion,POCl3,electrode pastes,n-type silicon solar cells,wet chemical etch back
更新于2025-09-23 15:19:57
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Dual Effective Dopant Based Hole Transport Layer for Stable and Efficient Perovskite Solar Cells
摘要： Conventionally, the hydroscopic nature of Li-TFSI and low boiling point of t-BP are considered as the primary limitations of hole transport layer (HTL), ultimately affecting the power conversion efficiency (PCE) and long-term stability of perovskite solar cell (PSC). To better stress these problems, a dual functional dopant termed PFPPY is reported. The in-depth operating mechanism of PFPPY with Spiro-OMeTAD, its profound effects on overall photovoltaic performance and device physics are systematically investigated. It is observed PFPPY can simultaneously take place of t-BP and FK209 in conventional HTL. By employing PFPPY as dopant cooperating with Spiro-OMeTAD, a higher PCE of 21.38% is achieved, compared with the reference device based on t-BP and FK209-doped Spiro-OMeTAD (19.69%). More importantly, the unencapsulated PFPPY-doped device shows greatly improved stability, maintaining over 90% of its initial PCE after 600 h in 40-50% RH. These findings provide a new strategy to optimize the HTL composition for efficient and stable PSCs.
关键词： Component engineering,Hole transport layer,Novel dopant,Perovskite Solar Cells
更新于2025-09-23 15:19:57
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Achieving over 21% Efficiency in Inverted Perovskite Solar Cells by Fluorinating a Dopant-Free Hole Transporting Material
摘要： Hole transporting materials (HTMs) play a critical role in ameliorating performance of perovskite solar cells (PSCs). Dedicated HTMs can not only improve the hole extraction and efficiency but also the stability. Herein, PFDT-COOH and fluorinated derivative, PFDT-2F-COOH were introduced as dopant-free HTMs for inverted PSCs. Compared to PFDT-COOH, PFDT-2F-COOH exhibits a deeper the highest occupied molecular orbital (HOMO) level, a higher work function on indium-tin oxide electrode, and an elevated built-in potential in the device. The PFDT-COOH device based on FA1-xMAxPbI3 mixed-cation perovskite exhibits a champion power conversion efficiency (PCE) of 20.64%, while PFDT-2F-COOH device exhibits a champion PCE of 21.68%, which is touching the highest value (21.7%) attained in inverted single-junction PSCs. The elevated efficiency is attributed to reduction of carrier recombination and enhancemnt of carrier extraction via fluorinated strategy. In addition, the two devices also show excellent operational and thermal stabilities. Therefore, our work offers a feasible strategy for high efficiency and stable inverted PSCs.
关键词： hole transporting materials,efficiency,dopant-free,stability,perovskite solar cells,fluorination
更新于2025-09-23 15:19:57
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Dopant Activation of In Situ Phosphorusa??Doped Silicon Using Multia??Pulse Nanosecond Laser Annealing
摘要： Nanosecond laser annealing was performed on ISPD silicon in single- and multi-pulse modes. the active phosphorus concentration was increased with the laser power density and number of laser pulses and more phosphorus was activated with nanosecond lasers than with millisecond lasers. Moreover, almost all the incorporated phosphorus atoms were activated by the nanosecond laser without major strain loss when ISPD silicon melt
关键词： phosphorus-doped silicon,nanosecond laser annealing,diffusion,dopant activation,strain
更新于2025-09-23 15:19:57
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Molecular engineering of highly efficient dopant-free spiro-type hole transporting materials for perovskite solar cells
摘要： Up to now, the most efficient perovskite solar cells (PSCs) typically utilize Spiro-OMeTAD as hole transporting materials (HTMs). The unique “spiro” structure offers appropriate energy levels for hole transfer and high thermal stability with suppressed aggregation. However, the pristine Spiro-OMeTAD requires additional oxidizing dopants to work efficiently due to its low hole mobility. To retain the advantages of spiral structure and overcome its shortcomings, we demonstrate the design of three dopant-free HTMs with spiral structure by molecular engineering, in which three groups with different conjugated lengths, namely benzene, naphthalene and anthracene, are inserted between spiral core and electron donor. These designed molecules, Y-1~Y-3, are initially identified with quantum chemical calculations based on the mother molecule X59 and then are obtained by easy synthetic routes. Our studies show that the intramolecular charge transfer (ICT) states are formed in the designed molecules due to the introduction of conjugated groups, which produces a self-doping effect without the need to add any external dopant. The best-performing PSCs using the dopant-free Y-1 as HTM achieves a champion power conversion efficiency (PCE) of 16.29% under one sun illumination, which is higher than that of devices with X59 as dopant-free HTMs (14.64%). The present work provides an effective strategy for designing, synthesizing of highly efficient and stable dopant-free HTMs.
关键词： Perovskites solar cells,Dopant-free,Hole-transporting materials,Quantum chemical calculations,Spiral structure
更新于2025-09-23 15:19:57
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[IEEE 2018 15th IEEE India Council International Conference (INDICON) - Coimbatore, India (2018.12.16-2018.12.18)] 2018 15th IEEE India Council International Conference (INDICON) - Influence of the Compositional Variation of Zn <sub/>x</sub> Cd <sub/>1a??x</sub> S (0 a?¤ x a?¤ 0.45) Buffer on Efficiency of Cu <sub/>2</sub> ZnSnSe <sub/>4</sub> Solar Cell: A Simulation
摘要： This paper investigates the manufacturability-aware process of p-n junction formation for photovoltaic cells involving with Si nanoparticle layer. The furnace-based dopant diffusion process of forming a p-n junction consumes a substantial amount of energy. In addition, repetitive production steps prevent the possibility of Si ink-based cells integrating onto ?exible substrates. This research examined the local heating dopant diffusion process by using a ?ber laser at a wavelength of 1064 nm. The infrared beam is delivered onto the wafer stack with a nanoparticle carbon layer and n-type Si ink layer on p-type Si substrates. The nanoparticle carbon ?lm absorbs infrared beam energy and converts photon energy as a thermal source to diffuse the n-type dopant in Si ink into the p-type Si wafer. The Si ink in this paper contains a mixture of Si nanoparticles and an n-type spin-on dopant solution. The TEM results show that Si nanoparticles are uniformly dispersed on the Si wafer surface. This research investigated sheet resistance as a function of laser parameters, including laser power, scanning speed, and pulse frequency for the samples coated with Si ink. Secondary ion mass spectroscopy measurements indicate the presence of an n-type dopant in p-type substrates, with an approximate diffusion depth of 100 nm. The results indicate that the proposed infrared laser treatment technique is promising for the formation of p-n junctions with Si ink-based photovoltaic cells.
关键词： silicon ink,spin-on dopant (SOD),silicon nanoparticle,carbon nanoparticle,?ber laser,Flexible photovoltaic cell,pn junction
更新于2025-09-23 15:19:57
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Lead (II) Propionate Additive and A Dopant-Free Polymer HTM for CsPbI2Br Perovskite Solar Cells
摘要： All-inorganic perovskites (CsPbI3 and CsPbI2Br), owing to their greater thermal stability compared to organic-inorganic hybrid perovskites, are becoming popular in perovskite photovoltaics but the problem that remains with CsPbI2Br (or CsPbI3) is the humidity-assisted phase transformation. Herein, we report about the formation of CsPbI2Br α-phase and improvement of its phase stability under ambient atmosphere (20-30 % relative humidity) by Pb (II) propionate additive in the CsPbI2Br precursor. Solar cells employing CsPbI2Br film with an optimum concentration of the additive (1 mol %), and a donor-acceptor type polymer (synthesized by us) as dopant-free hole transport material that has a better energy level matching with CsPbI2Br (compared to other polymers like P3HT, PTAA, asy-PBTBDT) work with a champion power conversion cell efficiency of 14.58 %. A continuous increase in the open-circuit voltage, reaching 1.36 V for 5 mol % of Pb (II) propionate manifests a remarkable defects-passivation effect by the additive.
关键词： Pb (II) propionate,All-inorganic perovskites,dopant-free hole transport material,solar cells,CsPbI2Br
更新于2025-09-23 15:19:57
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Barium doping effect on the photovoltaic performance and stability of MA0.4FA0.6BaxPb1-xIyCl3-y perovskite solar cells
摘要： Perovskite solar cells (PSCs) have earned widespread attention owing to its fast-growing power conversion efficiency (PCE). However, there are some challenges for this type of solar cells. The toxicity issue, current density-voltage (J-V) hysteresis, and uncertain stability hinder commercialization. In this study, we developed the PSCs with MA0.4FA0.6BaxPb1-xIyCl3-y film as active layer. The MA0.4FA0.6BaxPb1-xIyCl3-y film with various barium doping concentrations were fabricated by solvent engineering method. We investigate the surface morphology, crystal orientation, and optical property of various perovskite films. Furthermore, the in situ grazing-incidence wide-angle X-ray scattering (in-situ GIWAXS) is used to analyze the heating crystallization process of perovskite film. We discover that Ba can improve crystallinity and structural stability. For the optimal 5.0 mol% Ba replacement, the PCE of perovskite device is increased to 17.4%, the J-V hysteresis can be completely eliminated and the device demonstrates long-term stability.
关键词： in-situ GIWAXS,perovskite solar cell,J-V hysteresis,barium dopant,power conversion efficiency
更新于2025-09-23 15:19:57
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Modification of reduced graphene oxide layers by electron-withdrawing/donating units on molecular dopants: Facile metal-free counter electrode electrocatalysts for dye-sensitized solar cells
摘要： Small molecules of aniline (AN) and nitrobenzene (NB) doped on reduced graphene oxide nanosheets (rGO) represent the attractive Pt-free and earth abundant counter electrodes (CEs) in dye-sensitized solar cells (DSSCs). Scanning electron microscope and transmission electron microscope confirm a very thin layer structure with wrinkled and folded nanosheets. The binding between AN or NB and rGO is confirmed by Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). In this work, two different redox electrolytes are investigated: I?/I3? and [Co(bpy)3]3+/2+. Compared to rGO electrode-based DSSCs, the AN-rGO (1:10) and NB-rGO (1:10) electrode-based DSSCs applying I?/I3? and [Co(bpy)3]3+/2+ electrolytes show 40–50% and 30–35% increase in power conversion efficiency, respectively. Furthermore, both AN-rGO (1:10) and NB-rGO (1:10) perform stably upon electrochemical continuous test. Such excellent photoelectric performance correlates with the induced charge transfer between reduced graphene oxide and the molecules which effectively promotes the reduction and regeneration of I?/I3? and [Co(bpy)3]3+/2+ ions.
关键词： Electrocatalyst,Dye-sensitized solar cell,Molecular dopant,Reduced graphene oxide,Counter electrode
更新于2025-09-23 15:19:57
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Is methanol a dopant under atmospheric pressure photoionization conditions?
摘要： Using a modified atmospheric pressure photoionization (APPI) source coupled to a tunable vacuum ultraviolet source at the SOLEIL synchrotron radiation facility, we determined the appearance energy of protonated methanol monomer and dimers at different source temperatures. The experimental data indicated that protonated monomers can be formed through the direct photoionization of neutral methanol by the second emission band of a krypton discharge UV lamp at 116.49 nm (10.64 eV) explaining why methanol can be considered as a weak dopant under APPI conditions. This point is in contradiction with the previously proposed mechanism where photoionization of methanol dimer was followed by the dissociation of the protonated methanol dimer into protonated methanol monomer.
关键词： dopant,synchrotron,ionization process,methanol,Atmospheric pressure photoionization
更新于2025-09-19 17:15:36