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Light(Science & Applications) 2024年第6期13卷 1008-1011页

作者： Markus Suta inorganic photoactive materials Faculty of Mathematics and Natural SciencesHeinrich Heine University DusseldorfDusseldorfGermany

An ultra-simple and miniaturized spectrometer using an arbitrarily shaped pinhole as diffraction element reconstructs a broadband spectrum from the information of diffraction of monochromatic radiation by clever computational reconstruction *** circumvents complex calibration procedures and paves the way to cost-effective on-chip spectrometers combining fast acquisition without significant loss in spectral resolution.

关键词： arbitrarily shaped element

Extending the dynamic temperature range of Boltzmann thermometers

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Light(Science & Applications) 2022年第12期11卷 3069-3079页

作者： Thomas Pieter van Swieten Jesse Merlijin Steenhoff Auke Vlasblom Ravi de Berg Sam Pieter Mattern Freddy Teunis Rabouw Markus Suta Andries Meijerink Debye Institute for Nanomaterials Science Utrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands inorganic photoactive materials Heinrich Heine University DüsseldorfUniversitätsstraBe 140225 DüsseldorfGermany

Lanthanide-doped(nano)crystals are an important class of materials in luminescence *** working mechanism of these thermometers is diverse but most often relies on variation of the ratio of emission intensities from two thermally coupled excited states with *** low temperatures,nonradiative coupling between the states can be slow compared to radiative decay,but,at higher temperatures,the two states reach thermal equilibrium due to faster nonradiative *** thermal equilibrium,the intensity ratio follows Boltzmann statistics,which gives a convenient model to calibrate the ***,we investigate multiple strategies to shift the onset of thermal equilibrium to lower temperatures,which enables Boltzmann thermometry in a wider dynamic *** use Eu^(3+)-doped microcrystals as a model system and find that the nonradiative coupling rates increase for host lattices with higher vibrational energies and shorter lanthanide-ligand distances,which reduces the onset temperature of thermal equilibrium by more than 400 *** additionally reveal that thermometers with excited states coupled by electricdipole transitions have lower onset temperatures than those with magnetic-dipole-coupled states due to selection *** insights provide essential guidelines for the optimization of Boltzmann thermometers to operate in an extended temperature range.

关键词： equilibrium excited dynamic

One ion to catch them all: Targeted high-precision Boltzmann thermometry over a wide temperature range with Gd^(3+)

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Light(Science & Applications) 2021年第12期10卷 2443-2454页

作者： Dechao Yu Huaiyong Li Dawei Zhang Qinyuan Zhang Andries Meijerink Markus Suta Engineering Research Center of Optical Instrument and System The Ministry of EducationShanghai Key Laboratory of Modern Optical SystemsUniversity of Shanghai for Science and TechnologyShanghai 200093China Condensed Matter and Interfaces Debye Institute for Nanomaterials ScienceDepartment of ChemistryUtrecht UniversityPrincetonplein 13584 CC UtrechtThe Netherlands School of materials Science and Engineering Liaocheng UniversityLiaocheng 252059China State Key Laboratory of Luminescent materials and Devices and Institute of Optical Communication MaterialsSouth China University of TechnologyGuangzhou 510641China inorganic photoactive materials Institute of Inorganic ChemistryHeinrich Heine University DüsseldorfUniversitätsstraße 140225 DüsseldorfGermany

Ratiometric luminescence thermometry with trivalent lanthanide ions and their 4f^(n) energy levels is an emerging technique for non-invasive remote temperature sensing with high spatial and temporal *** ratiometric luminescence thermometry often relies on thermal coupling between two closely lying energy levels governed by Boltzmann’s *** its simplicity,Boltzmann thermometry with two excited levels allows precise temperature sensing,but only within a limited temperature *** low temperatures slow down the nonradiative transitions required to generate a measurable population in the higher excitation level,temperatures that are too high favour equalized populations of the two excited levels,at the expense of low relative thermal *** this work,we extend the concept of Boltzmann thermometry to more than two excited levels and provide quantitative guidelines that link the choice of energy gaps between multiple excited states to the performance in different temperature *** this approach,it is possible to retain the high relative sensitivity and precision of the temperature measurement over a wide temperature range within the same *** demonstrate this concept using YAl_(3)(BO_(3))_(4)(YAB):Pr^(3+),Gd^(3+)with an excited 6 PJ crystal field and spin-orbit split levels of Gd^(3+)in the UV range to avoid a thermal black body background even at the highest *** phosphor is easily excitable with inexpensive and powerful blue LEDs at 450 ***-background luminescence thermometry is realized by using blue-to-UV energy transfer upconversion with the Pr^(3+)−Gd^(3+)couple upon excitation in the visible *** method allows us to cover a temperature window between 30 and 800 K.

关键词： excited excitation luminescence

Efficient organic-inorganic hybrid cathode interfacial layer enabled by polymeric dopant and its application in large-area polymer solar cells

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Science China Chemistry 2019年第1期62卷 67-73页

作者： Sheng Dong Kai Zhang Xiang Liu Qingwu Yin Hin-Lap Yip Fei Huang Yong Cao Institute of Polymer Optoelectronic materials and Devices State Key Laboratory of Luminescent Materials and DevicesSouth China University of Technology

An organic-inorganic hybrid cathode interfacial layer(CIL) was developed by doping ZnO with the naphthalene-diimide based derivative NDI-PFNBr. It was found the resulting organic-inorganic hybrid CIL showed apparently improved conductivity and could act as an effective cathode interlayer to modify indium tin oxide(ITO) transparent electrodes. As a result, by employing the blend of PTB7-Th:PC71BM as the photoactive layer, the inverted polymer solar cells(PSCs) exhibited a remarkable enhancement of power conversion efficiency(PCE) from 8.52% for the control device to 10.04% for the device fabricated with the hybrid CIL. Moreover, all device parameters were simultaneously improved by using this hybrid CIL. The improved open-circuit voltage(VOC) was attributed to the reduced work function of the ITO cathode, whereas the enhancements in fill factor(FF) and short-circuit current density(JSC) were assigned to the increased conductivity and more effective charge extraction and collection at interface. Encouragingly, when the thickness of the hybrid CIL was increased to 80 nm, the resulting device could still keep a PCE of 8.81%, exhibiting less thickness dependence. Considering these advantages, 16 and 93 cm2large-area PSCs modules were successfully fabricated from the hybrid CIL by using doctor-blade coating techniques and yielded a remarkable PCE of8.05% and 4.49%, respectively. These results indicated that the hybrid CIL could be a promising candidate to serve as the cathode interlayer for high-performance large-area inverted PSCs.

关键词： hybrid cathode interfacial layer large-area module doctor-blade coating polymer solar cells

Advances to Stabilize photoactive Phase of FAPbI_(3)Perovskite

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Chinese Journal of Chemistry 2023年第20期41卷 2730-2745页

作者： Kailin Li Huanping Zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing100871 China

Recently,hybrid organic-inorganic perovskite materials have drawn widespread attention because of their outstanding optoelectrical properties(i.e.,high absorption coefficient,long carrier diffusion distance),hence they are suitable light-absorbing materials for photovoltaic *** all perovskite materials,formamidinium lead iodide(FAPbI3)based solar cells exhibit impressive power conversion efficiency(PCE)at laboratory stage,showing great potential to compete with silicon-based solar ***,FAPbI3 still suffers from poor phase stability which is the prior problem that needs to be addressed before its further *** be precise,the photoactive phase(αphase)is thermodynamically metastable at room temperature,which not only makesαphase tend to transform into photoinactive phase(δphase),but also causes competitive crystallization between two phases during the film preparation process,making it hard to fabricate pureα-FAPbI3 *** our review,we summarized key factors that are vital for obtaining high-quality FAPbI3 perovskite thin films and enhancing the stability of FAPbI3 photoactive *** of all,precursor solution stability is of great importance since the conditions of precursor solution determine the nucleation and crystal growth process of *** introducing coordinating additives,using FAPbI3 single crystal as raw material or applying co-solution strategy,the impurities formed by side reaction during precursor solution aging can be effectively suppressed,thus the stability of FAPbI3 solution can be greatly ***,the crystallization kinetics of FAPbI3 have been systematically manipulated to obtain dense and large grain size perovskite *** introducing intermediate phase,regulating the surface energy,and retarding the crystal growth of FAPbI3 in crystallization process,not only films without pinholes and fewer grain boundaries can be obtained,the pre-formedδphase at room temperature can also be well-s

关键词： FAPbI_(3)perovskite Stability Precursor Crystallization Thermodynamics

Treating CsPbI_(3) Perovskite with Pyrrolidinium Iodide to Improve the Performance of Perovskite Solar Cells

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Journal of Renewable materials 2023年第8期11卷 3193-3201页

作者： Qixian Zhang Yi Guo Huicong Liu Weiping Li Liqun Zhu Haining Chen School of materials Science and Engineering Beihang UniversityBeijing100191China

All-inorganic CsPbI_(3) perovskite has attracted wide attention due to its desirable optical bandgap(Eg:∼1.7 eV)as well as high chemical ***,the photovoltaic performance of CsPbI_(3) perovskite solar cells(PSCs)was limited by severe nonradiative charge recombination due to high defect density at the grain boundary and surface of perovskiteﬁ*** address this issue,a pyrrolidinium iodide(PyI)molecule was introduced to modify the surface and grain boundary of CsPbI_(3) perovskiteﬁlms to passivate defects,which improves the quality of CsPbI_(3) perovskiteﬁlms as well as induces the generation of a quasi-2D Py_(2)CsPb_(2)I_(7) capping layer between per-ovskite layer and hole transport *** quasi-2D Py_(2)CsPb_(2)I_(7) capping layer optimizes interface contact between CsPbI_(3) perovskite layer and hole transport layer and blocks the electron transfer from CsPbI_(3) perovskite photoactive layer to the hole transport *** a result,the performance of CsPbI_(3) PSCs is well improved to 17.87%for power conversion efﬁciency(PCE)with an ultra-high ﬁll factor(FF)of *** addition,the PyI mole-cule modiﬁed CsPbI_(3) perovskite devices exhibit excellent stability,which remains its initial PCE almost unchanged after aging for 35 days under the dry air atmosphere(temperature:20℃–30℃,control relative humid-ity(RH):<10%).

关键词： CsPbI_(3) inorganic perovskite defect passivation pyrrolidinium iodide

Multi-component assembly of luminescent rare earth hybrid materials

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Journal of Rare Earths 2019年第2期37卷 113-123页

作者： Qiuping Li Bing Yan School of materials and Chemical Engineering Ningbo University of Technology School of Chemical Science and Engineering Tongji University

This review focuses on the recent research progress in the multi-component assembly of luminescent rare earth hybrid materials, which is based on the luminescent rare earth compounds and two or more other building units, including the other photoactive species. It covers the multi-component luminescent rare earth hybrids which was assembled with different(a) organic-inorganic polymeric units,(b)nanoporous units,(c) nanoparticle composites or(d) other developing special units. Finally, future challenges and opportunities in this field are discussed. Herein it mainly focuses on the work of Yan's group in recent years.

关键词： Multi-component assembly Rare earth ions Hybrid materials Luminescence

Side-chains Engineering of Conjugated Polymers toward Additive-free Non-fullerene Organic Solar Cells

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Chinese Journal of Polymer Science 2021年第1期39卷 43-50,I0005页

作者： Feng Liu Dan Wang Jun-Yu Li Cheng-Yi Xiao Yong-Gang Wu Wei-Wei Li Guang-Sheng Fu College of Physics Science&Technology Hebei UniversityBaoding 071002China Beijing Advanced Innovation Center for Soft Matter Science and Engineering&State Key Laboratory of Organic-inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

Side-chain engineering plays a significant role in the design of conjugated materials. In this work, a series of conjugated polymers PBDB-T-R with functionalized groups at the end of side units were developed as electron donor for organic solar cells(OSCs). The donor polymers PBDB-T-I and PBDB-T-OAc with iodine and acetate end groups exhibited similar absorption and energy levels, but showed much improved PCEs in OSCs compared to the polymer PBDB-T-H without substitutions at the end groups. Additionally, we found that PBDB-T-I and PBDB-T-OAc based cells exhibited optimized performance when using chloroform as solution-processed solvent without any additives. These results indicate that these conjugated polymers can act as self-additive to fabricate photoactive layers via solution process in OSCs.

关键词： Organic solar cells Non-fullerene End group Additive Crystallinity

The voltage loss in organic solar cells

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Journal of Semiconductors 2023年第1期44卷 7-9页

作者： Zheng Tang Liming Ding State Key Laboratory for Modification of Chemical Fibers and Polymer materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

The power conversion efficiency(PCE)for donor-accepto bulk-heterojunction organic solar cells(OSCs)has reached~20%[1-3],approaching that for inorganic solar cells,due to the development of key photoactive materials[4-14].The short-circuit current density(Jsc)and the fill factor(FF)fo state-of-the-art OSCs are already close to the thermodynam ic upper limit predicted by Shockley-Queisser theory[15],but the open-circuit voltage(Voc)is low,limiting the overall per formance of OSCs.

关键词： approaching limiting limit

Enhancement of photoelectric performance for CsPbI2Br solar cells by the synergistic effect of binary additives

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Journal of Materiomics 2023年第1期9卷 27-34页

作者： Qiulu Chen Like Lin Yanzhou Wang Zhe Gao Yujun Fu Qiming Liu Junshuai Li Deyan He School of materials and Energy LONGi Institute of Future TechnologyLanzhou UniversityLanzhou730000China College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China

CsPbI_(2)Br-based perovskite solar cells(PSCs)have attracted much attention because of their excellent phase stability and appropriate ***,numerous defects of undercoordinated ions or mobile species are the sites of carrier nonradiative recombination,causing a low power conversion efficiency(PCE).In this work,NaCl and nitrogen-doped graphene quantum dots(N-GQDs)as binary additives are introduced into perovskite precursor to obtain high-quality photoactive *** ion(Cl^(-))is incorporated into perovskite due to the same physical and chemical properties as bromine(Br^(-)),that align the energy level of CsPbI_(2)Br,decrease the energy barrier between perovskite and P3HT to promote carrier transport and extraction,hence result in the reduced energy ***,because of its good conductivity,N-GQDs at grain boundaries can rapidly conduct photogenerated electrons to SnO_(2),suppressing carrier recombination at grain ***,the trap state density of the CsPbI_(2)Br film with binary additives is reduced,which could prolong the carrier lifetime,and improve surface *** a result,a PCE of 15.37%for CsPbI_(2)Br PSCs with binary additives is obtained,which shows~22.76%relative increment compare with the pristine ***,a simple and convenient optimization strategy of binary additives for PSCs is proposed in this work.

关键词： All-inorganic perovskite solar cells Synergistic effect Carrier transport Binary additives engineering