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perovskite-grains
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An easy method to modify PEDOT:PSS/perovskite interfaces for solar cells with efficiency exceeding 15%
, Article RSC Advances ; Volume 6, Issue 70 , 2016 , Pages 65594-65599 ; 20462069 (ISSN) ; Tajabadi, F ; Shiu, H. S ; Sedighi, R ; Jokar, E ; Gholipour, S ; Taghavinia, N ; Afshar, S ; Diau, E. W. G ; Sharif University of Technology
Royal Society of Chemistry
2016
Abstract
Herein, we show that surface treatment of PEDOT:PSS films using propionic acid (PA) results in better device performance for the resulting CH3NH3PbI3 perovskite solar cells (PCE > 15%). N2 blow spreading of PA appears critical in enhanced performance. This weak acid treatment leads to no worse roughness, while providing larger perovskite grains
Influence of perovskite morphology on slow and fast charge transport and hysteresis in the perovskite solar cells
, Article Journal of Physical Chemistry Letters ; Volume 7, Issue 22 , 2016 , Pages 4614-4621 ; 19487185 (ISSN) ; Moshaii, A ; Alizadeh, A ; Gharibzadeh, S ; Mohammadpour, R ; Sharif University of Technology
American Chemical Society
2016
Abstract
We have investigated the influence of perovskite morphology on slow and fast charge transport in the perovskite solar cells. Solar cells with different perovskite cuboid sizes (50-300 nm) have been fabricated using various methylammonium iodide concentrations. Both the low-frequency capacitance and hysteresis are maximum for the cell with the largest perovskite grains (300 nm). The low-frequency capacitance is about three orders of magnitude greater than the intermediate frequency capacitance, indicating the great role of ions on the slow responses and hysteresis. The measurement of open-circuit voltage decay indicates that for the large grains of 300 nm up to 70% of Voc remains across the...