تصفح Gas Processing Center حسب المؤلف "Zheng, Kaibo"
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Constructing water-resistant CH3NH3PbI3 perovskite films: Via coordination interaction
Li, Bo; Fei, Chengbin; Zheng, Kaibo; Qu, Xuanhui; Pullerits, Tönu; Cao, Guozhong; Tian, Jianjun... more authors ... less authors ( Royal Society of Chemistry , 2016 , Article)Organic-inorganic halide CH3NH3PbI3 (MAPbI3) perovskite solar cells (PSCs) have attracted intensive attention due to their high power conversion efficiency and low fabrication cost. However, MAPbI3 is known to be very ... -
Correlating structure and electronic band-edge properties in organolead halide perovskites nanoparticles
Zhu, Qiushi; Zheng, Kaibo; Abdellah, Mohamed; Generalov, Alexander; Haase, D�rthe; Carlson, Stefan; Niu, Yuran; Heimdal, Jimmy; Engdahl, Anders; Messing, Maria E.; Pullerits, Tonu; Canton, Sophie E.... more authors ... less authors ( Royal Society of Chemistry , 2016 , Article)After having emerged as primary contenders in the race for highly efficient optoelectronics materials, organolead halide perovskites (OHLP) are now being investigated in the nanoscale regime as promising building blocks ... -
Direct Experimental Evidence for Photoinduced Strong-Coupling Polarons in Organolead Halide Perovskite Nanoparticles
Zheng, Kaibo; Abdellah, Mohamed; Zhu, Qiushi; Kong, Qingyu; Jennings, Guy; Kurtz, Charles A.; Messing, Maria E.; Niu, Yuran; Gosztola, David J.; Al-Marri, Mohammed J.; Zhang, Xiaoyi; Pullerits, Tonu; Canton, Sophie E.... more authors ... less authors ( American Chemical Society , 2016 , Article)Echoing the roaring success of their bulk counterparts, nano-objects built from organolead halide perovskites (OLHP) present bright prospects for surpassing the performances of their conventional organic and inorganic ... -
Drastic difference between hole and electron injection through the gradient shell of Cd: XSeyZn1- xS1- y quantum dots
Abdellah, Mohamed; Poulsen, Felipe; Zhu, Qiushi; Zhu, Nan; Žídek, Karel; Chábera, Pavel; Corti, Annamaria; Hansen, Thorsten; Chi, Qijin; Canton, Sophie E.; Zheng, Kaibo; Pullerits, Tõnu... more authors ... less authors ( Royal Society of Chemistry , 2017 , Article)Ultrafast fluorescence spectroscopy was used to investigate the hole injection in CdxSeyZn1−xS1−y gradient core–shell quantum dot (CSQD) sensitized p-type NiO photocathodes. A series of CSQDs with a wide range of shell ... -
Enhanced Size Selection in Two-Photon Excitation for CsPbBr3 Perovskite Nanocrystals
Chen, Junsheng; Chábera, Pavel; Pascher, Torbjörn; Messing, Maria E.; Schaller, Richard; Canton, Sophie; Zheng, Kaibo; Pullerits, Tõnu... more authors ... less authors ( American Chemical Society , 2017 , Article)Cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs), with large two-photon absorption (TPA) cross-section and bright photoluminescence (PL), have been demonstrated as stable two-photon-pumped lasing medium. With ... -
High Excitation Intensity Opens a New Trapping Channel in Organic-Inorganic Hybrid Perovskite Nanoparticles
Zheng, Kaibo; Zidek, Karel; Abdellah, Mohamed; Chen, JunSheng; Chabera, Pavel; Zhang, Wei; Al-Marri, Mohammed J.; Pullerits, Tonu... more authors ... less authors ( American Chemical Society , 2016 , Article)We investigated the excited-state dynamics of CH3NH3PbBr3 perovskite nanoparticles (NPs) and bulk crystals under various excitation intensity regimes using transient absorption spectroscopy. We confirmed the sub-band gap ... -
Hot electron and hole dynamics in thiol-capped CdSe quantum dots revealed by 2D electronic spectroscopy
Lenngren, Nils; Abdellah, Mohamed A.; Zheng, Kaibo; Al-Marri, Mohammed J.; Zigmantas, Donatas; Žídek, Karel; Pullerits, Tõnu... more authors ... less authors ( Royal Society of Chemistry , 2016 , Article)Colloidal quantum dots (QDs) have attracted interest as materials for opto-electronic applications, wherein their efficient energy use requires the understanding of carrier relaxation. In QDs capped by bifunctional thiols, ... -
Insights into charge carrier dynamics in organo-metal halide perovskites: From neat films to solar cells
Peng, Jiajun; Chen, Yani; Zheng, Kaibo; Pullerits, Tõnu; Liang, Ziqi ( Royal Society of Chemistry , 2017 , Article Review)Organo-metal halide perovskites have recently obtained world-wide attention as promising solar cell materials. They have broad and strong light absorption along with excellent carrier transport properties which partially ... -
Inter-phase charge and energy transfer in Ruddlesden-Popper 2D perovskites: Critical role of the spacing cations
Zheng, Kaibo; Chen, Yani; Sun, Yong; Chen, Junsheng; Chábera, Pavel; Schaller, Richard; Al-Marri, Mohammed J.; Canton, Sophie E.; Liang, Ziqi; Pullerits, Tõnu... more authors ... less authors ( Royal Society of Chemistry , 2018 , Article)Photo-generated charge carrier dynamics in Ruddlesden-Popper 2D perovskites with linear (n-BA) and branched (iso-BA) butylamine as spacing cations have been studied by using transient absorption and time-resolved ... -
Photostability of the Oleic Acid-Encapsulated Water-Soluble CdxSeyZn1-xS1-y Gradient Core-Shell Quantum Dots
Chen, Junsheng; Yang, Bin; Li, Chuanshuai; Zheng, Kaibo; Zidek, Karel; Pullerits, Tonu... more authors ... less authors ( American Chemical Society , 2017 , Article)Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention - both for their potential in applications and for studies of ... -
Size-And Wavelength-Dependent Two-Photon Absorption Cross-Section of CsPbBr3 Perovskite Quantum Dots
Chen, Junsheng; Zidek, Karel; Chabera, Pavel; Liu, Dongzhou; Cheng, Pengfei; Nuuttila, Lauri; Al-Marri, Mohammed J.; Lehtivuori, Heli; Messing, Maria E.; Han, Keli; Zheng, Kaibo; Pullerits, Tonu... more authors ... less authors ( American Chemical Society , 2017 , Article)All-inorganic colloidal perovskite quantum dots (QDs) based on cesium, lead, and halide have recently emerged as promising light emitting materials. CsPbBr3 QDs have also been demonstrated as stable two-photon-pumped lasing ... -
Surface plasmon inhibited photo-luminescence activation in CdSe/ZnS core-shell quantum dots
Chen, Junsheng; Zidek, Karel; Abdellah, Mohamed; Al-Marri, Mohammed J; Zheng, Kaibo; Pullerits, TOnu... more authors ... less authors ( Institute of Physics Publishing , 2016 , Article)In a composite film of Cdx Sey Zn1-x S1-y gradient core-shell quantum dots (QDs) and gold nanorods (NRs), the optical properties of the QDs are drastically affected by the plasmonic nanoparticles. We provide a careful study ... -
Tailoring Organic Cation of 2D Air-Stable Organometal Halide Perovskites for Highly Efficient Planar Solar Cells
Chen, Yani; Sun, Yong; Peng, Jiajun; Zhang, Wei; Su, Xiaojun; Zheng, Kaibo; Pullerits, Tõnu; Liang, Ziqi... more authors ... less authors ( Wiley-VCH Verlag , 2017 , Article)2D perovskites have recently been shown to exhibit significantly improved environmental stability. Derived from their 3D analogues, 2D perovskites are formed by inserting bulky alkylammonium cations in‐between the anionic ... -
Time-resolved terahertz spectroscopy reveals the influence of charged sensitizing quantum dots on the electron dynamics in ZnO
N., Sesha Bamini; Němec, Hynek; Žídek, Karel; Abdellah, Mohamed; Al-Marri, Mohammed J.; Chábera, Pavel; Ponseca, Carlito; Zheng, Kaibo; Pullerits, Tönu... more authors ... less authors ( Royal Society of Chemistry , 2017 , Article)Photoinitiated charge carrier dynamics in ZnO nanoparticles sensitized by CdSe quantum dots is studied using transient absorption spectroscopy and time-resolved terahertz spectroscopy. The evolution of the transient spectra ... -
Trap States and Their Dynamics in Organometal Halide Perovskite Nanoparticles and Bulk Crystals
Zheng, Kaibo; Žídek, Karel; Abdellah, Mohamed; Messing, Maria E.; Al-Marri, Mohammed J.; Pullerits, Tõnu... more authors ... less authors ( American Chemical Society , 2016 , Article)Organometal halide perovskites have attracted tremendous attention for optoelectronic applications. Charge carrier trapping is one of the dominant processes often deteriorating the performance of devices. Here, we investigate ...