Searched for: author%3A%22Guo%2C+Dengyang%22
(1 - 8 of 8)
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Lin, Yuze (author), Li, Tao (author), Liu, Ye (author), Bahrami, Behzad (author), Guo, Dengyang (author), Fang, Yanjun (author), Shao, Yuchuan (author), Wang, Qi (author), Savenije, T.J. (author)
A long photoluminescence decay lifetime has been regarded as a generic indication of long charge carrier recombination lifetime in semiconductors such as metal halide perovskites (MHPs), which have shown tremendous success in solar cells. Here, we report that MHP polycrystalline films with extrinsic metal ions have a very long charge...
journal article 2021
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Guo, Dengyang (author)
Metal halide perovskites (MHPs) are interesting candidates for application in photovoltaic devices. During the past decade the efficiency of perovskite solar cells has improved enormously exceeding now values over 24%. In an MHP absorber layer, charge carriers are generated on optical excitation, and decay by band-to-band recombination or by...
doctoral thesis 2019
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Wei, Z. (author), Guo, Dengyang (author), Thieme, J. (author), Katan, Claudine (author), Caselli, V.M. (author), Even, Jacky (author), Savenije, T.J. (author)
Despite intense research into the optoelectronic properties of metal halide perovskites (MHPs), sub-bandgap absorption in MHPs remains largely unexplored. Here we recorded two-photon absorption spectra of MHPs using the time-resolved microwave conductivity technique. A two-step upward trend is observed in the two-photon absorption spectrum...
journal article 2019
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Guo, Dengyang (author), Andaji Garmaroudi, Zahra (author), Abdi-Jalebi, Mojtaba (author), Stranks, Samuel D. (author), Savenije, T.J. (author)
The highest reported efficiencies of metal halide perovskite (MHP) solar cells are all based on mixed perovskites, such as (FA,MA,Cs)Pb(I<sub>1-x</sub>Br<sub>x</sub>)<sub>3</sub>. Despite demonstrated structural changes induced by light soaking, it is unclear how the charge carrier dynamics are affected across this entire material family....
journal article 2019
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Guo, Dengyang (author), Caselli, V.M. (author), Hutter, E.M. (author), Savenije, T.J. (author)
While the power conversion efficiency of metal halide perovskite (MHP) solar cells has increased enormously, the open-circuit voltage, V <sub>oc</sub> , is still below the conceivable limit. Here, we derive the Fermi level splitting, μ <sub>F</sub> , for various types of noncontacted MHPs, which sets a limit for their achievable V <sub>oc<...
journal article 2019
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Andaji-Garmaroudi, Zahra (author), Abdi-Jalebi, Mojtaba (author), Guo, Dengyang (author), Macpherson, Stuart (author), Sadhanala, Aditya (author), Tennyson, Elizabeth M. (author), Ruggeri, Edoardo (author), Anaya, Miguel (author), Savenije, T.J. (author)
Mixed-halide lead perovskites have attracted significant attention in the field of photovoltaics and other optoelectronic applications due to their promising bandgap tunability and device performance. Here, the changes in photoluminescence and photoconductance of solution-processed triple-cation mixed-halide (Cs<sub>0.06</sub>MA<sub>0.15</sub...
journal article 2019
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Guo, Dengyang (author), Bartesaghi, D. (author), Wei, Haotong (author), Hutter, E.M. (author), Huang, Jinsong (author), Savenije, T.J. (author)
In view of its band gap of 2.2 eV and its stability, methylammonium lead bromide (MAPbBr<sub>3</sub>) is a possible candidate to serve as a light absorber in a subcell of a multijunction solar cell. Using complementary temperature-dependent time-resolved microwave conductance (TRMC) and photoluminescence (TRPL) measurements, we demonstrate...
journal article 2017
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Brenes, Roberto (author), Guo, Dengyang (author), Osherov, Anna (author), Noel, Nakita K. (author), Eames, Christopher (author), Hutter, E.M. (author), Pathak, Sandeep K. (author), Niroui, Farnaz (author), Friend, Richard H. (author), Islam, M. Saiful (author), Snaith, Henry J. (author), Bulović, Vladimir (author), Savenije, T.J. (author), Stranks, Samuel D. (author)
Metal halide perovskites are generating enormous excitement for use in solar cells and light-emission applications, but devices still show substantial non-radiative losses. Here, we show that by combining light and atmospheric treatments, we can increase the internal luminescence quantum efficiencies of polycrystalline perovskite films from 1...
journal article 2017
Searched for: author%3A%22Guo%2C+Dengyang%22
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