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您的检索式：作者名="Neil C.Greenham"
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| 1 | Thermalization and relaxation mediated by phonon management in tin-lead perovskites显示文摘Understanding and control of ultrafast non-equilibrium processes in semiconductors is key to making use of the full photon energy before relaxation,leading to new ways to break efficiency limits for solar energy conversion.In this work,we demonstrate the observation and modulation of slow relaxation in uniformly mixed tin-lead perovskites(MASn_(x)Pb_(1-x)I_(3)and CsSn_(x)Pb_(1-x)I_(3)nanocrystals).Transient absorption measurements reveal that slow cooling mediated by a hot phonon bottleneck effect appears at carrier densities above~10^(18)cm^(−3)for tin-lead alloy nanocrystals,and tin addition is found to give rise to suppressed cooling.Within the alloy nanoparticles,the combination of a newly introduced high-energy band,screened Fröhlich interaction,suppressed Klemens decay and reduced thermal conductivity(acoustic phonon transport)with increased tin content contributes to the slowed relaxation.For inorganic nanocrystals where defect states couple strongly with carriers,sodium doping has been confirmed to benefit in maintaining hot carriers by decoupling them from deep defects,leading to a decreased energy-loss rate during thermalization and an enhanced hot phonon bottleneck effect.The slow cooling we observe uncovers the intrinsic photophysics of perovskite nanocrystals,with implications for photovoltaic applications where suppressed cooling could lead to hot-carrier solar cells. | Linjie Dai Junzhi Ye Neil C.Greenham | 2023 | Light(Science & Applications)2023，12，9： | 1 |
| 2 | Influence of Halide Choice on Formation of Low-Dimensional Perovskite Interlayer in Efficient Perovskite Solar Cells显示文摘Recent advances in heterojunction and interfacial engineering of perovskite solar cells(PSCs)have enabled great progress in developing highly efficient and stable devices.Nevertheless,the effect of halide choice on the formation mechanism,crystallography,and photoelectric properties of the lowdimensional phase still requires further detailed study.In this work,we present key insights into the significance of halide choice when designing passivation strategies comprising large organic spacer salts,clarifying the effect of anions on the formation of quasi-2D/3D heterojunctions.To demonstrate the importance of halide influences,we employ novel neo-pentylammonium halide salts with different halide anions(neoPAX,X=I,Br,or Cl).We find that regardless of halide selection,iodide-based(neoPA)_(2)(FA)_((n-1))PbnI_((3n+1))phases are formed above the perovskite substrate,while the added halide anions diffuse and passivate the perovskite bulk.In addition,we also find the halide choice has an influence on the degree of dimensionality(n).Comparing the three halides,we find that chloride-based salts exhibit superior crystallographic,enhanced carrier transport,and extraction compared to the iodide and bromide analogs.As a result,we report high power conversion efficiency in quasi-2D/3D PSCs,which are optimal when using chloride salts,reaching up to 23.35%,and improving long-term stability. | Xueping Liu Thomas Webb Linjie Dai Kangyu Ji Joel A.Smith Rachel C.Kilbride Mozhgan Yavari Jinxin Bi Aobo Ren Yuanyuan Huang Zhuo Wang Yonglong Shen Guosheng Shao Stephen J.Sweeney Steven Hinder Hui Li David G.Lidzey Samuel D.Stranks Neil C.Greenham S.Ravi P.Silva Wei Zhang | 2022 | Energy & Environmental Materials2022，5，2： | 0 |
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