2020
DOI: 10.1002/solr.202000098
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Potassium‐Induced Phase Stability Enables Stable and Efficient Wide‐Bandgap Perovskite Solar Cells

Abstract: Wide‐bandgap perovskites have great potential to enable high‐efficiency tandem photovoltaics by combining with the well‐established low‐bandgap absorbers. However, such wide‐bandgap perovskites are often necessarily constructed with a high Br content, and thus faced with issues of phase segregation–induced photoinstability and high defect density, severely hindering their photovoltaic performance. Herein, a remarkable boost of the stability and efficiency of wide‐bandgap perovskite solar cells (PSCs) is demons… Show more

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Cited by 42 publications
(35 citation statements)
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“…[ 32–38 ] normalK+ addition was found to be one of the most efficient methods (compared with other alkali metal ions) in the prevention of ion migration in a broad compositional range of perovskites. [ 32,34,38,39 ] Even though there is an abundance of experimental evidence on the beneficial effects of normalK+ addition, its exact role in preventing the segregation and its position in the perovskite lattice remain unclear. normalK+ can occupy the interstitial sites in the perovskite lattice due to its relatively small radius or remain on the grain boundaries.…”
Section: Figurementioning
confidence: 99%
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“…[ 32–38 ] normalK+ addition was found to be one of the most efficient methods (compared with other alkali metal ions) in the prevention of ion migration in a broad compositional range of perovskites. [ 32,34,38,39 ] Even though there is an abundance of experimental evidence on the beneficial effects of normalK+ addition, its exact role in preventing the segregation and its position in the perovskite lattice remain unclear. normalK+ can occupy the interstitial sites in the perovskite lattice due to its relatively small radius or remain on the grain boundaries.…”
Section: Figurementioning
confidence: 99%
“…It is important to note that the MAPb(Br 0.6 I 0.4 ) 3 perovskite is a significantly less stable system than the double or triple cation ones used in other studies. [ 32,38,40 ] Also, the 3:2 Br − :I − ratio is far from the stable composition. [ 45,46 ] This allows us to study the extent of stabilization provided by normalK+ ions.…”
Section: Figurementioning
confidence: 99%
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“…In this manuscript, we rst compare the effects of the addition of KI addition on the optical and microstructural properties of TC and conrm previous ndings in the reported literature. 23,[25][26][27] We then perform focussed investigations into the effect of the addition of KI on material and device stability under ambient/high-humidity conditions. Specically we add KI into a TC precursor solution at different concentrations and fabricate planar perovskite solar cells, comparing the performance of devices using electron transport layers (ETL) formed from a nanoparticle tin oxide (SnO 2 ) solution with those based on titanium dioxide (TiO 2 ).…”
Section: Introductionmentioning
confidence: 99%