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High‐Performance Planar Solar Cells Based On CH 3 NH 3 PbI 3‐ x Cl x Perovskites with Determined Chlorine Mole Fraction
Author(s) -
Li Yunlong,
Sun Weihai,
Yan Weibo,
Ye Senyun,
Peng Haitao,
Liu Zhiwei,
Bian Zuqiang,
Huang Chunhui
Publication year - 2015
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201501289
Subject(s) - perovskite (structure) , materials science , pedot:pss , perovskite solar cell , spin coating , energy conversion efficiency , analytical chemistry (journal) , mole fraction , solar cell , open circuit voltage , inorganic chemistry , nanotechnology , thin film , crystallography , chemistry , optoelectronics , organic chemistry , physics , layer (electronics) , quantum mechanics , voltage
Solution‐processable hybrid perovskite solar cells are a new member of next generation photovoltaics. In the present work, a low‐temperature two‐step dipping method is proposed for the fabrication of CH 3 NH 3 PbI 3‐ x Cl x perovskite films on the indium tin oxide glass/poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) substrate. The bandgaps of the CH 3 NH 3 PbI 3‐ x Cl x perovskite films are tuned in the range between 1.54 and 1.59 eV by adjusting the PbCl 2 mole fraction ( n Cl /( n Cl + n I )) in the initial mixed precursor solution from 0.10 to 0.40. The maximum chlorine mole fraction measured by a unique potentiometric titration method in the produced CH 3 NH 3 PbI 3‐ x Cl x films can be up to 0.220 ± 0.020 ( x = 0.660 ± 0.060), which is much higher than that produced by a one‐step spin‐coating method (0.056 ± 0.015, x = 0.17 ± 0.04). The corresponding solar cell with the CH 3 NH 3 PbI 2.34±0.06 Cl 0.66±0.06 perovskite film sandwiched between PEDOT:PSS and C 60 layers exhibits a power conversion efficiency as high as 14.5%. Meanwhile, the open‐circuit potential ( V oc ) of the device reaches 1.11 V, which is the highest V oc reported in the perovskite solar cells fabricated on PEDOT:PSS so far.