A dual-functional asymmetric squaraine-based low band gap hole transporting material for efficient perovskite solar cells
- Authors
- Paek, Sanghyun; Rub, Malik Abdul; Choi, Hyeju; Kosa, Samia A.; Alamry, Khalid A.; Cho, Jin Woo; Gao, Peng; Ko, Jaejung; Asiri, Abdullah M.; Nazeeruddin, Mohammad Khaja
- Issue Date
- 2016
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- NANOSCALE, v.8, no.12, pp.6335 - 6340
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANOSCALE
- Volume
- 8
- Number
- 12
- Start Page
- 6335
- End Page
- 6340
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/90373
- DOI
- 10.1039/c5nr05697g
- ISSN
- 2040-3364
- Abstract
- We demonstrate for the first time an asymmetric squaraine-based low band-gap hole transporting material, which acted as both light harvesting and hole transporting layers in methylammonium lead triiodide perovskite solar cells. Opto-electrochemical characterization revealed extremely high molar extinction coefficients of the absorption bands in the low energy region and prominent space charge delocalization due to its electronically asymmetric nature. A suitable band alignment of the squaraine HOMO level with the valence band edge of the perovskite, and the conduction band of the TiO2 with LUMO of the perovskite allowed a cascade of hole extraction and electron injection, respectively. Red-shifted absorption was observed for both HTMs in thin films coated on the perovskite, and the optimized devices exhibited an impressive PCE of 14.7% under full sunlight illumination (100 mW cm(-2), AM1.5 G). The efficiency value is comparable to that of the devices using a state-of-the-art spiro-OMeTAD hole transport layer under similar conditions. Ambient stability after 300 h revealed that 88% of the initial efficiency remained for JK-216D, and almost no change for JK-217D, indicating that the devices had good long-term stability thus suggesting that the asymmetric squaraines have great potential as a dual-functional HTM for high performance perovskite solar cells.
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Collections - College of Science and Technology > Department of Advanced Materials Chemistry > 1. Journal Articles
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