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Structural, optical, and electrical properties of phase- controlled cesium lead iodide nanowires

Nano Research 2017年第4期10卷 1107-1114页

作者： Minliang Lai Qiao Kong Connor G. Bischak Yi Yu Letian Dou Samuel W. Eaton Naomi S. Ginsberg Peidong Yang Department of chemistry University of California Berkeley California 94720 USA Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Kavli Energy Nanosciences Institute Berkeley California 94720 USA Molecular Biophysics and Integrative Bioimaging Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics University of California Berkeley California 94720 USA Department of Materials Science and Engineering University of California Berkeley California 94720 USA

Cesium lead iodide （CsPbIa）, in its black perovskite phase, has a suitable bandgap and high quantum efficiency for photovoltaic applications. However, CsPbI3 tends to crystalize into a yellow non-perovskite phase, which has poor optoelectronic properties, at room temperature. Therefore, controlling the phase transition in CsPbI3 is critical for practical application of this material. Here we report a systematic study of the phase transition of one-dimensional CsPbI3 nanowires and their corresponding structural, optical, and electrical properties. We show the formation of perovskite black phase CsPbIa nanowires from the non-perovskite yellow phase through rapid thermal quenching. Post-transformed black phase CsPbI3 nanowires exhibit increased photoluminescence emission intensity with a shrinking of the bandgap from 2.78 to 1.76 eV. The perovskite nanowires were photoconductive and showed a fast photoresponse and excellent stability at room temperature. These promising optical and electrical properties make the perovskite CsPbI3 nanowires attractive for a variety of nanoscale optoelectronic devices.

关键词： inorganic halide perovskite CsPbI3 phase transition stability

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Lead halide perovskite nanowires stabilized by block copolymers for Langmuir-Blodgett assembly

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Nano Research 2020年第5期13卷 1453-1458页

作者： Hao Liu Martin Siron Mengyu Gao Dylan Lu Yehonadav Bekenstein Dandan Zhang Letian Dou A.Paul Alivisatos Peidong Yang Department of chemistry University of CaliforniaBerkeleyCalifornia 94720USA Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720USA Materials Science Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Kavli Energy NanoScience Institute BerkeleyCalifornia 94720USA Center for Advanced Low-dimension Materials Donghua UniversityShanghai 201620China Department of Materials Science and Engineering Technion-Israel institute of technologyHaifa 3200003Israe Davidson School of Chemical Engineering Purdue UniversityWest LafayetteIndiana 47907USA

The rapid development of solar cells based on lead halide perovskites(LHPs)has prompted very active research activities in other closely-related *** nanostructures of such materials display superior optoelectronic ***,onedimensional(1D)LHPs nanowires show anisotropic optical properties when they are highly ***,the ionic nature makes them very sensitive to external environment,limiting their large scale practical ***,we introduce an amphiphilic block copolymer,polystyrene-block-poly(4-vinylpyridine)(PS-P4VP),to chemically modify the surface of colloidal CsPbBr3 *** resulting core-shell nanowires show enhanced photoluminescent emission and good colloidal stability against *** advantage of the stability enhancement,we further applied a modified Langmuir-Blodgett technique to assemble monolayers of highly aligned nanowires,and studied their anisotropic optical properties.

关键词： nanowires anisotropic optical properties aligned monolayer lead halide perovskites stability enhancement

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Phase Transitions and Anion Exchange in All-inorganic Halide Perovskites

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Accounts of Materials Research 2020年第1期1卷 3-15页

作者： Julian A.Steele Minliang Lai Ye Zhang Zhenni Lin Johan Hofkens Maarten B.J.Roeffaers Peidong Yang cMACS Department of Microbial and Molecular SystemsKU Leuven3001 LeuvenBelgium Department of chemistry University of CaliforniaBerkeleyCalifornia 94720United States Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720United States Department of Materials Science and Engineering University of CaliforniaBerkeleyCalifornia 94720United States Department of chemistry KU Leuven3001 HeverleeBelgium Max Plank Institute for Polymer Research Mainz D-55128Germany Kavli Energy Nano Science Institute BerkeleyCalifornia 94720United States

CONSPECTUS:A new generation of semiconducting materials based on metal halide perovskites has recently been launched into the scientific spotlight,exhibiting outstanding optoelectronic properties and providing promise for the development of efficient optical *** a vivid example,solar cells made from these materials have quickly reached conversion efficiencies exceeding 25%,now on par with well-established technologies,like *** widespread success is due,in part,to a unique ability to retain high-quality optoelectronic performance while being easily solutionprocessed into thin *** feature is what defines them as a brand-new class of optoelectronic materials,with the ability to compete with traditional semiconductors requiring higher processing costs,like the III−Vs or II−***,the interesting photophysics of metal halide perovskites come with a catch;their soft ionic lattice promotes complex thermal-induced phase transitions and a high capacity for postsynthetic compositional changes,e.g.,halide anion *** dynamic behavior has ultimately made understanding several important structure−property relationships ambiguous and obstructed a clear path toward commercialization due to inherent phase *** aim in this Account is to highlight the fundamental aspects of metal halide perovskites that dictate a stable crystal structure and enable efficient anion exchange,through the lens of thermodynamic preference and phase formation *** the allinorganic CsPbI3‑xBrx system as a suitable case study,we focus on several ways in which its thermodynamically unstable perovskite structure can be maintained at room temperature and elucidate the restructuring pathways taken during *** addition,we will discuss the origin and mechanisms of postsynthetic anion exchange in CsPbX3(X=I,Br,Cl)perovskites,with emphasis made toward direct visualization using in situ optical microspectroscopy and arriving at quantitative resu

关键词： properties. perovskite halide

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