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Stable PbS colloidal quantum dot inks enable blade‑coating infrared solar cells

Frontiers of Optoelectronics 2023年第3期16卷 131-140页

作者： Xinzhao Zhao Mingyu Li Tianjun Ma Jun Yan Gomaa Mohamed Gomaa Khalaf Chao Chen Hsien‑Yi Hsu Haisheng Song Jiang Tang Wuhan National Laboratory for Optoelectronics(WNLO) Huazhong University of Science and Technology(HUST)Wuhan 430074China School of Optical and Electronic Information Huazhong University of Science and Technology(HUST)Wuhan 430074China School of Energy and Environment and Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Wenzhou Advanced Manufacturing Technology Research Institute of Huazhong University of Science and Technology Wenzhou 325035China

Infrared solar cells are more efective than normal bandgap solar cells at reducing the spectral loss in the near-infrared region,thus also at broadening the absorption spectra and improving power conversion efciency.PbS colloidal quantum dots(QDs)with tunable bandgap are ideal infrared photovoltaic materials.However,QD solar cell production sufers from small-areabased spin-coating fabrication methods and unstable QD ink.Herein,the QD ink stability mechanism was fully investigated according to Lewis acid–base theory and colloid stability theory.We further studied a mixed solvent system using dimethylformamide and butylamine,compatible with the scalable manufacture of method-blade coating.Based on the ink system,100 cm2 of uniform and dense near-infrared PbS QDs(~0.96 eV)flm was successfully prepared by blade coating.The average efciencies of above absorber-based devices reached 11.14%under AM1.5G illumination,and the 800 nm-fltered efciency achieved 4.28%.Both were the top values among blade coating method based devices.The newly developed ink showed excellent stability,and the device performance based on the ink stored for 7 h was similar to that of fresh ink.The matched solvent system for stable PbS QD ink represents a crucial step toward large area blade coating photoelectric devices.

关键词： PbS quantum dots Solvent engineering Colloid stability blade coating Infrared solar cells

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Biopolymer passivation for high-performance perovskite solar cells by blade coating

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Journal of Energy Chemistry 2021年第3期30卷 45-52页

作者： Shudi Qiu Xin Xu Linxiang Zeng Zhen Wang Yijun Chen Culling Zhang Chaohui Li Jinlong Hu Tingting Shi Yaohua Mai Fei Guo Institute of New Energy Technology College of Information Science and TechnologyJinan UniversityGuangzhou 510632GuangdongChina Siyuan Laboratory Guangzhou Key Laboratory of Vacuum coating Technologies and New Energy Materials Department of Physics Jinan UniversityGuangzhou 510632GuangdongChina College of Chemistry Environmental Engineering Datong University.Datong 037009ShanxiChina National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002HenanChina

Thin films of perovskite deposited from solution inevitably introduce large number of defects,which serve as recombination centers and are detrimental for solar cell performance.Although many small molecules and polymers have been delicately designed to migrate defects of perovskite films,exploiting credible passivation agents based on natural materials would offer an alternative approach.Here,an ecofriendly and cost-effective biomaterial,ploy-L-lysine(PLL),is identified to effectively passivate the defects of perovskite films prepared by blade-coating.It is found that incorporation of a small amount(2.5 mg mL^(-1))of PLL significantly boosts the performance of printed devices,yielding a high efficiency of 19.45% with an increase in open-circuit voltage by up to 100 mV.Density functional theory calculations combined with X-ray photoelectron spectroscopy reveal that the functional groups(-NH2,-COOH)of PLL effectively migrate the Pb-I antisite defects via Pb-N coordination and suppress the formation of metallic Pb in the blade-coated perovskite film.This work suggests a viable avenue to exploit passivation agents from natural materials for preparation of high-quality perovskite layers for optoelectronic applications.

关键词： Perovskite solar cells blade coating Biopolymer passivation Density functional theory

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A Solution Processable Flexible Transparent Conductive Graphene/PEDOT : PSS Film Fabricated by Spin and blade coating

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Journal of Shanghai Jiaotong university(Science) 2018年第1期23卷 106-111页

作者：房霄竹范志君顾宜宸史佳雯陈敏陈学文邱韶华 ZABIHI Fatemeh ESLAMIAN Morteza 陈倩栎 University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shenzhen SAPO Photoelectric Co. Ltd. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University State Key Laboratory for Composite Materials School of Materials Science and Engineering Shanghai Jiao Tong University

Flexible transparent conductive films were made on PET substrates by spin and blade coating, using graphene sheets dispersed in PEDOT : PSS solution. Ultrasonic substrate vibration was used to improve microstructure and properties of the films. Comparing to the pristine PEDOT : PSS film, the sheet resistance is 3 to 4 orders of magnitude lower with the addition of graphene. The conductivity and reproducibility of the film are improved for two-layer films comparing to one-layer films, with a reduction in transparency. Films prepared with substrate vibration showed lower sheet resistance for one-layer films, as the size of dewetting areas is reduced. In addition, large-area flexible films with desirable conductivity and transmittance were successfully fabricated by blade coating, which is promising, as the process is low-cost, scalable and compatible with roll-to-roll manufacturing.

关键词： graphene PEDOT:PSS solution-processing blade coating ultrasonic substrate vibration

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Hyperbranched phthalocyanine enabling black-phase formamidinium perovskite solar cells processing and operating in humidity open air

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Journal of Energy Chemistry 2022年第8期31卷 141-149,I0005页

作者： Rong Li Jiale Ding Xijiao Mu Yifei Kang Anran Wang Weihui Bi Yunhe Zhang Jing Cao Qingfeng Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012JilinChina Engineering Research Center of Super Engineering Plastics Ministry of EducationCollege of ChemistryJilin UniversityChangchun 130012JilinChina State Key Laboratory of Applied Organic Chemistry Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu ProvinceCollege of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou 730000GansuChina

The extreme instability of pureα-phase FAPbI_(3) under high humidity conditions restricts the highthroughput fabrication in unmodified air environments,resulting in poor performance ofα-phase FAPbI_(3) perovskite devices obtained by scalable fabrication methods.Here we synthesized hyperbranched copper phthalocyanine(HCuPc)as a supramolecular additive with twisted phthalocyanine units to realize the molecular-level encapsulation at the grain boundaries through supramolecular interaction,which greatly broadened the processing window of FAPbI_(3) under high humidity.At the same time,unlike traditional encapsulation layer that carrier can only be collected by tunneling effect,the twisted phthalocyanine ring of HCu Pc in perovskite films is more conducive to hole extraction.Finally,a record efficiency was achieved in pure FAPbI_(3) based inverted structured solar cell by blade-coating to the best of our knowledge,even under unmodified humid air conditions(relative humidity of 65%–85%).The best operational stability of 3D pure FAPbI_(3) devices can also be achieved at the same time and unencapsulated HCuPc-FAPbI_(3) device can even operate with negligible degradation for 100 h in the open air(RH 30%–40%).

关键词： Perovskite solar cells α-Phase FAPbI_(3) blade coating Humid air stability Copper phthalocyanine

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Efficient fully blade-coated perovskite solar cells in air with nanometer-thick bathocuproine buffer layer

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Nano Research 2021年第4期14卷 1034-1042页

作者： Sergio Castro-Hermosa Luana Wouk Izabela Silva Bicalho Luiza de Queiroz Correa Bas de Jong Lucio Cina Thomas M.Brown Diego Bagnis CSEM Brasil Avenida Jose Candido da Silveira200031035-536 Belo HorizonteBrazil CHOSE(Centre for Hybrid and Organic Solar Energy) Department of Electronic EngineeringUniversity of Rome Tor VergataVia del Politecnico 100133 RomeItaly Hydro Engineering and Agricultural Development Research Group(GHIDA) Faculty of EngineeringUniversidad SurcolombianaAvenida Pastrana Borrero-Carrera 1410001 NeivaColombia Cicci Research srl via Giordania 227 58100 GrossetoItaly Department of Biotechnology Chemistry and PharmacyUniversity of SienaVia A.Moro 253100 SienaItaly

Fully printed perovskite solar cells(PSCs)were fabricated in air with all constituent layers,except for electrodes,deposited by the blade coating technique.The PSCs incorporated,for the first time,a nanometer-thick printed bathocuproine(BCP)hole blocking buffer using blade coating and deposited at relative humidity up to 50%.The PSCs with a p-i-n structure(glass/indium tin oxide(ITO)/poly(3,4-ethylenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)/CH_(3)NH_(3)Pbl_(3)/[6,6]-phenyl-C_(61)-butyric acid methyl ester(PCBM)/BCP/Ag)delivered a maximum power conversion efficiency(PCE)of 14.9%on an active area of 0.5 cm^(2)when measured under standard test conditions.The PSCs with a blade coated BCP delivered performance of 10%and 63%higher(in relative terms)than those incorporating a spin coated BCP or without any BCP film,respectively.The atomic force microscopy(AFM)showed that blade coated films were more homogeneous and acted also as a surface planarizer leading to a reduction of roughness which improved BCP/Ag interface lowering charge recombination.The demonstration of 15%efficient devices with all constituent layers,including nanometer-thick BCP(〜10 nm),deposited by blade coating in air,demonstrates a route for industrialization of this technology.

关键词： perovskite buffer bathocuproine(BCP) blade coating printed electronics

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Room Temperature Printing and In Situ Investigation of Perovskite Thin Films for Printable Solar Cells

Room Temperature Printing and In Situ Investigation of Perov...

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第八届新型太阳能材料科学与技术学术研讨会

作者： Gang Li The Hong Kong Polytechnic University

Hybrid organo-metal halide perovskite solar cells(PSCs) are promising candidates for next generation photovoltaic device primarily due to their high efficiency, printability, and low cost. However, devices fabricated by scalable techniques are still lagged the state-ofthe-art spin coated devices because the power conversion efficiency(PCE) is highly dependent on the morphology and crystallization kinetics under a controlled environment, and delicate solvent system engineering. In this talk, we will present the recent works using in-situ technique to guide the development of high-performance PSCs using blade coating technology.(a) Via a laminar air-knife assisted room temperature meniscus coating approach to control the drying kinetics during the solidification process, we recently manufacturing friendly, antisolvent-free room-temperature coating of hysteresis-free PSCs with power conversion efficiency(PCE) of 20.26% for 0.06 cm

关键词： Perovskite solar cells blade coating crystallization kinetics in-situ ambient zwitterionic surfactant

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