Journal
ADVANCED SUSTAINABLE SYSTEMS
Volume 5, Issue 8, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202100107
Keywords
aggregation; Lewis acid; P3CT-K; perovskite solar cells; tris(pentafluorophenyl)borane
Funding
- National Natural Science Foundation of China [21975273, 21671127]
- Natural Science Foundation of Guangdong Province, China [2019A1515012156]
- Major Project of Guangdong Department of Education [2017KZDXM034]
- 2020 Ka Shing Foundation Cross-Disciplinary Research Grant [2020LKSFG01A]
- Scientific Research Starting Foundation of Outstanding Young Scholar of Shandong University
- Fundamental Research Funds of Shandong University
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Polythiophene-acid-based conjugated polyelectrolytes have shown promising potential as hole-transport materials for inverted planar perovskite devices. A simple and effective strategy involving tris(pentafluorophenyl)borane as a Lewis acid has been developed to regulate the aggregation of the polyelectrolytes, leading to improved efficiency of perovskite solar cells.
Polythiophene-acid-based conjugated polyelectrolytes have shown great potential as hole-transport materials for the fabrication of inverted planar perovskite devices with decent power conversion efficiencies (PCEs), benefiting from their tunable structure and functional properties. In contrast to the current progress mainly from side functional group modification, here a simple and effective strategy is reported to effectively regulate the aggregation of P3CT-K through the modification of the thiophene units in the main chain. A small molecule tris(pentafluorophenyl)borane (TPB) is applied as the Lewis acid to interact with the thiophene unit of polythiophene chain and regulate the aggregation of conjugated polyelectrolytes. The control of aggregation of P3CT-K not only elevates the hole mobility of P3CT-K, but also suppresses charge recombination in P3CT-K composite films. Consequently, the high efficiency of inverted MAPbI(3) perovskite solar cells is achieved with a peak power conversion efficiency of 20.7% and simultaneously improved short-circuit current density and fill factor. This work provides an effective method for the aggregation control of the polyelectrolyte hole materials to promote the performance of inverted planar perovskite solar cells.
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