376 citations · 959 across the 19 of their papers we have counts for
19 papers
Reduced Optical Gain Threshold by Carrier Multiplication in Semiconductor Perovskite Nanocrystals
Zhen Zhang, Encheng Sun, Jian Li +4
Carrier multiplication (CM) describes a strong charge-carrier interaction process in semiconductor colloidal nanocrystals (NCs), wherein two band-edge excitons are simultaneously c…
Prolonged Phase Segregation of Mixed-Halide Perovskite Nanocrystals in the Dark
Xueying Ma, Yuhui Ye, Yang Xiao +6
A critical issue hindering the potential applications of semiconductor mixed-halide perovskites is the phase segregation effect, wherein localized regions enriched with one type of…
Complete Suppression of Phase Segregation in Mixed-Halide Perovskite Nanocrystals under Periodic Heating
Shengnan Feng, Rentong Duan, Yu Ju +5
Under continuous light illumination, it is known that localized domains with segregated halide compositions form in semiconducting mixed-halide perovskites, thus severely limiting…
Charge transfer via deep hole in the J51/N2200 blend
Xiaoyu Xie, Chunfeng Zhang, Haibo Ma
In recently developed non-fullerene acceptor (NFA) based organic solar cells (OSCs), both the donor and acceptor parts can be excited by absorbing light photons. Therefore, both el…
Quantum Interference in a Single Perovskite Nanocrystal
Yan Lv, Chunyang Yin, Chunfeng Zhang +4
Coherent manipulation of the exciton wave function in a single semiconductor colloidal nanocrystal (NC) has been actively pursued in the past decades without any success, mainly du…
Bright-exciton fine structures splittings in single perovskite nanocrystals
Chunyang Yin, Liyang Chen, Yan Lv +7
Although both epitaxial quantum dots (QDs) and colloidal nanocrystals (NCs) are quantum-confined semiconductor nanostructures, so far they have demonstrated dramatically-different…
Slow Auger Recombination of Charged Excitons in Nonblinking Perovskite Nanocrystals without Spectral Diffusion
Fengrui Hu, Chunyang Yin, Huichao Zhang +6
Over the last two decades, intensive research efforts have been devoted to the suppressions of photoluminescence (PL) blinking and Auger recombination in metal-chalcogenide nanocry…
Efficient Thermal Conductance in Organometallic Perovskite CH3NH3PbI3 Films
Qi Chen, Chunfeng Zhang, Mengya Zhu +10
Perovskite-based optoelectronic devices have shown great promise for solar conversion and other optoelectronic applications, but their long-term performance instability is regarded…
Single Photon Emission from Single Perovskite Nanocrystals of Cesium Lead Bromide
Fengrui Hu, Huichao Zhang, Chun Sun +7
The power conversion efficiency of photovoltaic devices based on semiconductor perovskites has reached ~20% after just several years of research efforts. With concomitant discoveri…
Magnetic dipolar interaction between correlated triplets created by singlet fission in tetracene crystals
Rui Wang, Chunfeng Zhang, Bo Zhang +3
Singlet fission (SF) can potentially break the Shockley-Queisser efficiency limit in single-junction solar cells by splitting one photo-excited singlet exciton (S1) into two triple…
Polarization-dependent exciton dynamics in tetracene single crystals
Bo Zhang, Chunfeng Zhang, Yanqing Xu +6
We conduct polarization-dependent ultrafast spectroscopy to study the dynamics of singlet fission in tetracene single crystals. The spectrotemporal species for singlet and triplet…
Ultrafast spectroscopy of quasiparticle dynamics in cuprate superconductors
Wei Li, Chunfeng Zhang, Xiaoyong Wang +2
Ultrafast pump-probe spectroscopy is a powerful tool to study the nonequilibrium dynamics in high-Tc cuprate superconductors. The photo-induced quasiparticle (QP) dynamics revealed…
Superlinear density dependence of singlet fission rate in tetracene films
Bo Zhang, Chunfeng Zhang, Rui Wang +6
We experimentally show that the rate of singlet fission in tetracene films has a superlinear dependence on the density of photo-excited singlet excitons with ultrafast transient ab…
Reducing the efficiency droop by lateral carrier confinement in InGaN/GaN quantum-well nanorods
Chentian Shi, Chunfeng Zhang, Fan Yang +6
Efficiency droop is a major obstacle facing high-power application of InGaN/GaN quantum-well (QW) light-emitting diodes. In this letter, we report the suppression of efficiency dro…
Enhanced Hot-Carrier Luminescence in Multilayer Reduced Graphene Oxide Nanospheres
Qi Chen, Chunfeng Zhang, Fei Xue +7
We report a method to promote photoluminescence emission in graphene materials by enhancing carrier scattering instead of directly modifying band structure in multilayer reduced gr…
Orbital-Selective Mottness in KxFe2-ySe2 Superconductors Revealed by Pump-Probe Spectroscopy
Wei Li, Chunfeng Zhang, Shenghua Liu +5
We report transient optical signatures of the orbital-selective Mottness in superconducting KxFe2-ySe2 crystals by using dual-color pump-probe spectroscopy. Besides multi-exponenti…
Defect recombination induced by density-activated carrier diffusion in nonpolar InGaN quantum wells
Fan Yang, Chunfeng Zhang, Chentian Shi +7
We report on the observation of carrier-diffusion-induced defect emission at high excitation density in a-plane InGaN single quantum wells. When increasing excitation density in a…
Ultrafast pump-probe spectroscopic signatures of superconducting and pseudogap phases in YBa2Cu3O7-δ films
Chunfeng Zhang, Wei Li, B. Gray +6
Femtosecond pump-probe spectroscopy is applied to identify transient optical signatures of phase transitions in optimally doped YBa2Cu3O7-δ films. To elucidate the dynamics of supe…
Temperature-dependent steady and transient emission properties of InGaN/GaN multiple quantum well nanorods
Bin Jiang, Chunfeng Zhang, Xiaoyong Wang +4
We observed different temperature-dependent behaviors of steady and transient emission properties in dry-etched InGaN/GaN multiple-quantum-well (MQW) nanorods and the parent MQWs.…