Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 168, Issue 3, Pages -Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/abe8ee
Keywords
conjugated polyelectrolytes; ionic liquids; hole-transport layer; perovskite solar cells
Funding
- National Natural Science Foundation of China [51672288, 21876120]
- Fundamental Research Funds for the Central Universities [20826041D4117]
- Major Program of Shandong Province Natural Science Foundation [ZR2017ZB0313]
- DICPQIBEBT [UN201705]
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The use of long-chain alkyl imidazolium ionic liquid (IL) can effectively suppress the aggregation of conjugated polyelectrolytes (CPE) in perovskite solar cells, leading to improved device efficiency. Combining IL with CPE results in a smoother hole transport layer, enhancing the film quality of the perovskite absorber.
Conjugated polyelectrolytes (CPEs) are promising hole transport materials for perovskite solar cells, whereas their severe intermolecular aggregation significantly affects the device performance. Here, long-chain alkyl imidazolium ionic liquid (IL) of 1-dodecyl-3-methylimidazolium bromide ([C(12)mim]Br) and conjugated polyelectrolytes of potassium poly[3-(4-carboxylatebutyl)thiophene (P3CT-K) are combined with different mass ratios. The UV-vis spectra and dynamic light scattering studies indicate that the aggregation behavior of P3CT-K is suppressed by IL, thus obtaining a smoother hole transport layer for the latter device fabrication, which efficiently improves the film quality of perovskite absorber and enhances the hole transport at the interface. As a consequence, the inverted PSCs based on P3CT-K/IL film as the HTL show considerable improvement in power conversion efficiency (PCE), from 16.21% to 18.81%, compared with pristine P3CT-K based device. These findings indicate that IL can effectively inhibit the aggregation of CPEs, providing a new pathway to further improve the performance of PSCs based on CPEs interlayer.
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