Abstract
We copolymerize a norbornene monomer bearing a pendant naphthalene diimide with a norbornene bearing a cinnamate pendant moiety to synthesize a crosslinkable electron-transporting polymer and study its use in solution-processed n-i-p perovskite solar cells. The crosslinked material exhibits over 90% transparency in the visible region and higher thermal stability (>300 °C) and lower surface energy than the corresponding homopolymer of the naphthalene diimide functionalized norbornene. Coating an ITO surface with the photo-crosslinked copolymer yields a slightly lower work function than homopolymer-coated ITO. We show that the morphologies of the perovskite films deposited on both polymers are similar (∼300 nm features) based upon scanning electron microscopy. Our solar-cell device results show that the crosslinked naphthalene diimide polymer gives a higher open-circuit voltage (1.08 vs 1.05 V), fill factor (average 64.43 vs 58.77%), and stabilized power conversion efficiency (12.28 vs 10.33%) compared to its non-crosslinked homopolymer counterpart, as well as reduced hysteresis. We attribute the improved performance to decreased work function, reduced nonradiative recombination, and higher shunt resistance.
Original language | English (US) |
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Pages (from-to) | 795-802 |
Number of pages | 8 |
Journal | Chemistry of Materials |
Volume | 36 |
Issue number | 2 |
DOIs | |
State | Published - Jan 23 2024 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Chemistry
- General Chemical Engineering
- Materials Chemistry