Abstract
As the most commonly used hole transport material (HTM) in tin-lead (Sn-Pb) perovskite solar cells (PSCs), poly(3,4-ethylenedioxythiophene) polystyrenesulfonate (PEDOT:PSS) limits the power conversion efficiency (PCE) and stability of the PSCs due to its acidic characteristics. Herein, an easily synthesized polymer HTM poly[(phenyl)imino[9-(2-ethylhexyl)carbazole]-2,7-diyl] (CzAn) with a shallow highest occupied molecular orbital (HOMO) level of -4.95 eV is used in a p-i-n structure, methylammonium-free, Sn-Pb PSC to replace PEDOT:PSS. Upon optimization using doping and surface engineering, high quality Sn-Pb PSCs could be successfully fabricated, boosting the PCE to 22.6% (stabilized PCE of 21.3%) compared with 21.2% for PEDOT:PSS. The perovskite films prepared on the modified CzAn HTM possess improved crystallinity, reduced trap-state density, and larger carrier mobility resulting in PSCs with greatly improved stability.
Original language | American English |
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Pages (from-to) | 3353-3361 |
Number of pages | 9 |
Journal | ACS Energy Letters |
Volume | 7 |
Issue number | 10 |
DOIs | |
State | Published - 2022 |
NREL Publication Number
- NREL/JA-5900-84532
Keywords
- carrier mobility
- crystallinity
- hole transport material
- perovskite solar cells
- power conversion efficiency
- stability
- trap-state density