Defect Passivation in Perovskite Solar Cells by Cyano-Based π-Conjugated Molecules for Improved Performance and Stability
Harrison, George T.
Mohammed, Omar F.
De Wolf, Stefaan
KAUST DepartmentKAUST Solar Center (KSC), Physical Sciences and Engineering Division (PSE)King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
KAUST Solar Center (KSC)
Physical Science and Engineering (PSE) Division
Chemical Science Program
Material Science and Engineering Program
Embargo End Date2021-07-09
Permanent link to this recordhttp://hdl.handle.net/10754/664141
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AbstractDefects at the surface and grain boundaries of metal–halide perovskite films lead to performance losses of perovskite solar cells (PSCs). Here, organic cyano-based π-conjugated molecules composed of indacenodithieno[3,2-b]thiophene (IDTT) are reported and it is found that their cyano group can effectively passivate such defects. To achieve a homogeneous distribution, these molecules are dissolved in the antisolvent, used to initiate the perovskite crystallization. It is found that these molecules are self-anchored at the grain boundaries due to their strong binding to undercoordinated Pb2+. On a device level, this passivation scheme enhances the charge separation and transport at the grain boundaries due to the well-matched energetic levels between the passivant and the perovskite. Consequently, these benefits contribute directly to the achievement of power conversion efficiencies as high as 21.2%, as well as the improved environmental and thermal stability of the PSCs. The surface treatment provides a new strategy to simultaneously passivate defects and enhance charge extraction/transport at the device interface by manipulating the anchoring groups of the molecules.
CitationWang, K., Liu, J., Yin, J., Aydin, E., Harrison, G. T., Liu, W., … De Wolf, S. (2020). Defect Passivation in Perovskite Solar Cells by Cyano-Based π-Conjugated Molecules for Improved Performance and Stability. Advanced Functional Materials, 2002861. doi:10.1002/adfm.202002861
SponsorsThis work was supported by the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. KAUST OSR-CARF URF/1/ 3079-33-01.
JournalAdvanced Functional Materials