Open AccessChloride Inclusion and Hole Transport Material Doping to Improve Methyl Ammonium Lead Bromide Perovskite-Based High Open-Circuit Voltage Solar Cells
Author(s) -
Eran Edri,
Saar Kirmayer,
Michael Kulbak,
Gary Hodes,
David Cahen
Publication year - 2014
Publication title -
the journal of physical chemistry letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.563
H-Index - 203
ISSN - 1948-7185
DOI - 10.1021/jz402706q
Subject(s) - perovskite (structure) , band gap , doping , tandem , open circuit voltage , materials science , optoelectronics , ammonium chloride , energy conversion efficiency , perovskite solar cell , ammonium bromide , short circuit , mesoporous material , voltage , analytical chemistry (journal) , chemistry , catalysis , electrical engineering , organic chemistry , pulmonary surfactant , biochemistry , composite material , engineering
Low-cost solar cells with high VOC, relatively small (EG - qVOC), and high qVOC/EG ratio, where EG is the absorber band gap, are long sought after, especially for use in tandem cells or other systems with spectral splitting. We report a significant improvement in CH3NH3PbBr3-based cells, using CH3NH3PbBr3-xClx, with EG = 2.3 eV, as the absorber in a mesoporous p-i-n device configuration. By p-doping an organic hole transport material with a deep HOMO level and wide band gap to reduce recombination, the cell's VOC increased to 1.5 V, a 0.2 V increase from our earlier results with the pristine Br analogue with an identical band gap. At the same time, in the most efficient devices, the current density increased from ∼1 to ∼4 mA/cm(2).