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TiO2 coated urchin-like SnO2 microspheres for efficient dye-sensitized solar cells

Nano Research 2014年第8期7卷 1154-1163页

作者： Amit Thapa Jiantao Zai hytham elbohy Prashant Poudel Nirmal Adhikari Xuefeng Qian Qiquan Qiao Center for Advanced Photovoltaics Department of Electrical Engineering South Dakota State University Brookings SD 57007 USA School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai 200240 China

Urchin-like SnO2 microspheres have been grown for use as photoanodes in dye-sensitized solar cells (DSSCs). We observed that a thin layer coating of TiO2 on urchin-like SnO2 microsphere photoanodes greatly enhanced dye loading capability and light scattering ability, and achieved comparable solar cell performance even at half the thickness of a typical nanocrystalline TiO2 photoanode. In addition, this photoanode only required attaching ∼55% of the amount of dye for efficient light harvesting compared to one based on nanocrystalline TiO2. Longer decay of transient photovoltage and higher charge recombination resistance evidenced from electrochemical impedance spectroscopy of the devices based on TiO2 coated urchin-like SnO2 revealed slower recombination rates of electrons as a result of the thin blocking layer of TiO2 coated on urchinlike SnO2. TiO2 coated urchin-like SnO2 showed the highest value (76.1 ms) of electron lifetime (τ) compared to 2.4 ms for bare urchin-like SnO2 and 14.9 ms for nanocrystalline TiO2. TiO2 coated SnO2 showed greatly enhanced open circuit voltage (V oc), short-circuit current density (J sc) and fill factor (FF) leading to a four-fold increase in efficiency increase compared to bare SnO2. Although TiO2 coated urchin-like SnO2 showed slightly lower cell efficiency than nanocrystalline TiO2, it only used a half thickness of photoanode and saved ∼45% of the amount of dye for efficient light harvesting compared to normal nanocrystalline TiO2.

关键词：染料敏化太阳能电池 SnO2 二氧化钛海胆涂覆微球纳米TiO2 TiO2涂层

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Synergistic engineering of hole transport materials in perovskite solar cells

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InfoMat 2020年第5期2卷 928-941页

作者： Sally Mabrouk Behzad Bahrami hytham elbohy Khan Mamun Reza Ashim Gurung Mao Liang Fan Wu Mingtai Wang Shangfeng Yang Qiquan Qiao Center for Advanced Photovoltaics Department of Electrical Engineering and Computer ScienceSouth Dakota State UniversityBrookingsSouth Dakota Physics Department Damietta UniversityNew Damietta CityEgypt Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Department of Applied ChemistryTianjin University of TechnologyTianjinChina Key Lab of Optoelectronic Materials and Devices School of ScienceHuzhou UniversityHuzhouChina Institute of Applied Technology Hefei Institutes of Physical ScienceChinese Academy of SciencesHefeiChina Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy ConversionDepartment of Materials Science and EngineeringSynergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefeiChina

In this work,methylammonium lead triiodide(CH3NH3PbI3)perovskite solar cells with efficiencies higher than 18%were achieved using a new nanocomposite hole transport layer(HTL)by doping poly(ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)with a mixed dopant of polyaniline(PANI)and graphene oxide(GO).A synergistic engineering between GO,PANI,and PEDOT:PSS was accomplished to introduce additional energy levels between perovskite and PEDOT:PSS and increase the conductivity of PEDOT:*** probe force microscope results confirmed that adding GO to PEDOT:PSS/PANI composite significantly reduced the average surface *** increased the open circuit voltage(Voc)to 1.05 V for the GO/PEDOT:PSS/PANI nanocomposite perovskite solar cells from the pristine PEDOT:PSS(Voc=0.95 V)and PEDOT:PSS/PANI(Voc=0.99 V).In addition,adding PANI to the HTLs substantially enhanced short circuit current density(Jsc).This was supported by the current sensing-atomic force microscopy(CS-AFM)and conductivity *** PANI doped films showed superior electrical conductivity compared with those without PANI as indicated by CS-AFM *** can fill the gaps between the microflakes of GO and give rise to more compact hole transport material(HTM)*** led to a higher Jsc after doping with PANI,which was consistent with the incident photon-to-current efficiency and electrochemical impedance spectroscopy *** results of X-ray diffraction(XRD)and AFM indicated the GO/PANI doped HTMs significantly improved the crystallinity,topography,and crystal size of the perovskite film grown on their surface.A higher efficiency of 18.12%for p-i-n perovskite solar cells has been obtained by adding the mixed dopant of GO,PANI,and PEDOT:PSS,demonstrating better stability than the pristine PEDOT:PSS cell.

关键词： composite hole transport material perovskite solar cell polyaniline and graphene oxide

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Tailored PEDOT:PSS hole transport layer for higher performance in perovskite solar cells: Enhancement of electrical and optical properties with improved morphology

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Journal of Energy Chemistry 2020年第5期29卷 41-50页

作者： Khan Mamun Reza Ashim Gurung Behzad Bahrami Sally Mabrouk hytham elbohy Rajesh Pathak Ke Chen Ashraful Haider Chowdhury Md Tawabur Rahman Steven Letourneau Hao-Cheng Yang Gopalan Saianand Jeffrey WElam Seth BDarling Qiquan Qiao Department of Electrical Engineering Center for Advanced PhotovoltaicsSouth Dakota State UniversityBrookings 57007SDUSA Physics Department Damietta UniversityNew Damietta 34517Egypt Applied Materials Division Argonne National LaboratoryArgonne 60439ILUSA Center for Nanoscale Materials Argonne National LaboratoryArgonne 60439ILUSA Global Innovative Centre for Advanced Nanomaterials Faculty of Engineering and Built EnvironmentThe University of NewcastleCallaghan 2308New South WalesAustralia Chemical Sciences and Engineering Division Argonne National LaboratoryLemont 60439ILUSA Institute for Molecular Engineering Argonne National LaboratoryLemont 60439ILUSA Institute for Molecular Engineering University of ChicagoChicago 60637ILUSA

Precise control over the charge carrier dynamics throughout the device can result in outstanding performance of perovskite solar cells(PSCs).Poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)is the most actively studied hole transport material in p-i-n structured ***,charge transport in the PEDOT:PSS is limited and inefficient because of its low conductivity with the presence of the weak ionic conductor *** addition,morphology of the underlying PEDOT:PSS layer in PSCs plays a crucial role in determining the optoelectronic quality of the active perovskite absorber *** work is focused on realization of a non-wetting conductive surface of hole transport layer suitable for the growth of larger perovskite crystalline *** is accomplished by employing a facile solventengineered(ethylene glycol and methanol)approach resulting in removal of the predominant PSS in PEDOT:*** consequence of acquiring larger perovskite crystalline domains was observed in the charge carrier dynamics studies,with the achievement of higher charge carrier lifetime,lower charge transport time and lower transfer impedance in the solvent-engineered PEDOT:PSS-based *** of this solventengineered treatment for the fabrication of MAPbI3 PSCs greatly increased the device stability witnessing a power conversion efficiency of 18.18%,which corresponds to^37%improvement compared to the untreated PEDOT:PSS based devices.

关键词： Perovskite solar cells PEDOT:PSS treatment Hole transport layer Non-wetting PEDOT:PSS surface

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Nanoscale control of grain boundary potential barrier, dopant density and filled trap state density for higher efficiency perovskite solar cells

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InfoMat 2020年第2期2卷 409-423页

作者： Behzad Bahrami Sally Mabrouk Nirmal Adhikari hytham elbohy Ashim Gurung Khan M.Reza Rajesh Pathak Ashraful H.Chowdhury Gopalan Saianand Wenjin Yue Jiantao Zai Xuefeng Qian Mao Liang Qiquan Qiao Department of Electrical Engineering and Computer Science Center for Advanced Photovoltaics and Sustainable EnergySouth Dakota State UniversityBrookingsSouth Dakota Physics Department Damietta UniversityNew Damietta CityEgypt Global Innovative Center for Advanced Nanomaterials Faculty of EngineeringThe University of NewcastleCallaghanNew South WalesAustralia College of Biochemical Engineering Anhui Polytechnic UniversityWuhuChina Shanghai Electrochemical Energy Devices Research Center School of Chemistry and Chemical EngineeringState Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong UniversityShanghaiChina Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Department of Applied ChemistryTianjin University of TechnologyTianjinChina

In this work,grain boundary(GB)potential barrier(ΔφGB),dopant density(Pnet),and filled trap state density(PGB,trap)were manipulated at the nanoscale by exposing the fabricated perovskite films to various relative humidity(RH)*** mapping of surface potential in the perovskite film revealed higher positive potential at GBs than inside the *** averageΔφGB,Pnet,and PGB,trap in the perovskite films decreased from 0%RH to 25%RH exposure,but increased when the RH increased to 35%RH and 45%*** clearly indicated that perovskite solar cells fabricated at 25%RH led to the lowest average GB potential,smallest dopant density,and least filled trap states *** is consistent with the highest photovoltaic efficiency of 18.16%at 25%RH among the different relative humidities from 0%to 45%RH.

关键词： dopant density filled trap state density grain boundary potential barrier perovskite solar cells relative humidity

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