2014
DOI: 10.1063/1.4891275
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Morphology-photovoltaic property correlation in perovskite solar cells: One-step versus two-step deposition of CH3NH3PbI3

Abstract: Perovskite CH3NH3PbI3 light absorber is deposited on the mesoporous TiO2 layer via one-step and two-step coating methods and their photovoltaic performances are compared. One-step coating using a solution containing CH3NH3I and PbI2 shows average power conversion efficiency (PCE) of 7.5%, while higher average PCE of 13.9% is obtained from two-step coating method, mainly due to higher voltage and fill factor. The coverage, pore-filling, and morphology of the deposited perovskite are found to be critical in phot… Show more

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Cited by 433 publications
(299 citation statements)
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“…When V OC is matched close to 1 sun conditions, the measured faster decays in devices aged for 4 h are likely a result of more recombination sites being present, a consequence of the increased number of electronic traps and mobile defects that account for the proposed loss in quasi-steady state photocurrent. [58][59][60] The extent to which mobile defects and electronics traps are linked is presently unknown, and whilst we acknowledge that our TPC/TPV measurements are primarily sensitive to processes that take place on the microsecond timescale, different kinetics could well be observed if these measurements are repeated on a timescale that is commensurate with defect mobility. [43][44][45][46][47] To identify the underlying mechanisms behind the irreversible loss in PCE of the reference cells, we note that recent work on aged CH 3 NH 3 PbI 3 fi lms identifi ed a detrimental photochemical reaction involving oxygen.…”
Section: Resultsmentioning
confidence: 99%
“…When V OC is matched close to 1 sun conditions, the measured faster decays in devices aged for 4 h are likely a result of more recombination sites being present, a consequence of the increased number of electronic traps and mobile defects that account for the proposed loss in quasi-steady state photocurrent. [58][59][60] The extent to which mobile defects and electronics traps are linked is presently unknown, and whilst we acknowledge that our TPC/TPV measurements are primarily sensitive to processes that take place on the microsecond timescale, different kinetics could well be observed if these measurements are repeated on a timescale that is commensurate with defect mobility. [43][44][45][46][47] To identify the underlying mechanisms behind the irreversible loss in PCE of the reference cells, we note that recent work on aged CH 3 NH 3 PbI 3 fi lms identifi ed a detrimental photochemical reaction involving oxygen.…”
Section: Resultsmentioning
confidence: 99%
“…As mentioned before, simple onestep methods often lead to inhomogeneous coverage of the substrates. [14,[102][103][104] In particular, Eperon et al studied the influence of the TiO 2 underlayer and its impact on perovskite-crystal formation when employing a non-stoichiometric mixture of MAI and PbCl 2 . They concluded that there is an www.advancedsciencenews.com unfavorable interaction between these layers, which leads to the growth of perovskite "pores", largely determined by the thickness of the perovskite film.…”
Section: One-step Depositionmentioning
confidence: 99%
“…[145,146] Two-step process based on the sequential deposition of inorganic and organic precursors, also adopts thermal annealing for perovskite crystal formation. [108,109,147,148] Bi et al investigated the effect of thermal annealing on structural, electrical, optical properties of MAPbI3 perovskite. [111] Noteworthy that thermal annealing works differently for perovskite films prepared from premixed solution and sequential deposition of inorganic/organic precursors.…”
Section: Heat Treatmentmentioning
confidence: 99%