2014
DOI: 10.1021/jz500858a
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Thermally Activated Exciton Dissociation and Recombination Control the Carrier Dynamics in Organometal Halide Perovskite

Abstract: Solar cells based on organometal halide perovskites have seen rapidly increasing efficiencies, now exceeding 15%. Despite this progress, there is still limited knowledge on the fundamental photophysics. Here we use microwave photoconductance and photoluminescence measurements to investigate the temperature dependence of the carrier generation, mobility, and recombination in (CH3NH3)PbI3. At temperatures maintaining the tetragonal crystal phase of the perovskite, we find an exciton binding energy of about 32 me… Show more

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Cited by 503 publications
(656 citation statements)
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“…Frost et al estimated the binding energy of excitons in this system to be about 0.7 meV -too small to affect significantly the photovoltaic performance [16]. This is in contradiction with experimental evidences that indicate a value in the range 6-55 meV [5,37,[67][68][69][70][71][72]. Solutions of the Bethe-Salpeter equation for a single molecular orientation revealed huge exciton binding energies of 153 meV for the cubic phase [39] and 40 meV for the tetragonal phase [32].…”
Section: Discussionmentioning
confidence: 83%
“…Frost et al estimated the binding energy of excitons in this system to be about 0.7 meV -too small to affect significantly the photovoltaic performance [16]. This is in contradiction with experimental evidences that indicate a value in the range 6-55 meV [5,37,[67][68][69][70][71][72]. Solutions of the Bethe-Salpeter equation for a single molecular orientation revealed huge exciton binding energies of 153 meV for the cubic phase [39] and 40 meV for the tetragonal phase [32].…”
Section: Discussionmentioning
confidence: 83%
“…The hole and electron mobilities in MAPI are reported to be in the 2-20 cm 2 /Vs range. 16,26,47 At the 1 sun V oc (~0.85V) there will remain a built in field of perhaps 0.3V. Under this field, the transit time of electrons and holes across the film is only a few ns.…”
Section: Modeling Double Exponential Tpv Decaysmentioning
confidence: 99%
“…There has also been efforts towards better understanding of material properties [14][15][16] , including the recombination strengths 4,[17][18][19] and mobility. 4,19,20 Despite the above mentioned exciting achievements in experimental research on perovskite solar cells, the corresponding theoretical understanding is lacking in many aspects. For example, while the detailed balance limits of efficiency based on radiative recombination was already reported 21 , the effect of Auger recombination is not clearly elucidated.…”
Section: Introductionmentioning
confidence: 99%