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Wei, Zimu
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Publications (5/5 displayed)
- 2020Charge Carrier Dynamics upon Sub-bandgap Excitation in Methylammonium Lead Iodide Thin Films: Effects of Urbach Tail, Deep Defects, and Two-Photon Absorptioncitations
- 2020Charge Carrier Dynamics upon Sub-bandgap Excitation in Methylammonium Lead Iodide Thin Filmscitations
- 2020Using Time-Resolved Photoconductivity Measurements to Reveal the Urbach Tail and Two Photon Absorption in MHPs
- 2019The importance of relativistic effects on two-photon absorption spectra in metal halide perovskitescitations
- 2019The importance of relativistic effects on two-photon absorption spectra in metal halide perovskitescitations
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article
Charge Carrier Dynamics upon Sub-bandgap Excitation in Methylammonium Lead Iodide Thin Films
Abstract
<p>To further understand the optoelectronic properties of metal halide perovskites, we investigate sub-bandgap absorption in methylammonium lead iodide (MAPbI3) films. Charge carrier dynamics are studied using time-resolved microwave conductivity measurements using sub-bandgap excitation. From changes in the decay dynamics as a function of excitation energy and intensity, we have identified three regimes: (i) Band-like charge transport at photon energies above 1.48 eV; (ii) a transitional regime between 1.48 and 1.40 eV; and (iii) below 1.40 eV localized optically active defects (8 × 1013 cm-3) dominate the absorption at low intensities, while two-photon absorption is observed at high intensities. We determined an Urbach energy of approximately 11.3 meV, indicative of a low structural and/or thermal disorder. Surprisingly, even excitation 120 meV below the bandgap leads to efficient charge transfer into electron (C60) or hole (spiro-OMeTAD) transport layers. Therefore, we conclude that for MAPbI3, the band tail states do not lead to nonradiative losses. </p>