期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 7, 期 22, 页码 6656-6663出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc00437h
关键词
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资金
- Swiss National Funds for Scientific Research [200020L_172929/1]
- European Research Council [ERC-320441-Chirallcarbon]
- Spanish Ministry of Economy and Competitiveness MINECO [CTQ2017-83531-R, CTQ2015-71154-P, CTQ2016-81911-REDT]
- Spanish Ministry of Economy and Competitiveness MINECO (Centro de Excelencia Severo Ochoa) [SEV-2016-0686]
- Spanish Ministry of Economy and Competitiveness MINECO (Unidad de Excelencia Maria de Maeztu) [MDM-2015-0538]
- CAM (FOTOCARBON project) [S2013/MIT-2841]
- Generalitat Valenciana [PROMETEO/2016/135, SEJI/2018/035, APOSTD/2017/081]
- European Feder funds [CTQ2015-71154-P]
- MINECO [RyC-2017-23500]
- Swiss National Science Foundation (SNSF) [PZENP2_173641]
- Swiss National Science Foundation (SNF) [200020L_172929, PZENP2_173641] Funding Source: Swiss National Science Foundation (SNF)
A flexible, saddle-like, p-conjugated skeleton composed of four fused thiophene rings forming a cyclooctatetrathiophene (CoTh) with four triphenylamines (CoTh-TTPA) is presented as a hole-transporting material (HTM) for perovskite solar cells. The new HTM shows a bright red color stemming from a direct conjugation between the TPA groups and the central CoTh scaffold. This results in a charge transfer band due to the combination of the weak acceptor moiety, the CoTh unit, and the electron-donating p-methoxytriphenylamine groups. CoTh-TTPA exhibits a suitable highest-occupied molecular orbital (HOMO) level in relation to the valence band edge of the perovskite, which ensures efficient hole extraction at the perovskite/HTM interface. It has been applied as the HTM in combination with a mixed perovskite ([ FAPbI3] 0.85[ MAPbBr3] 0.15) and a state-of-the-art triple cation perovskite ([(FAPbI3) 0.87(MAPbBr3) 0.13] 0.92[ CsPbI3] 0.08) reaching noticeable light-to-energy conversion efficiencies of 16.3 and 15.9%, respectively. These values are slightly lower than those measured for the benchmark spiro-OMeTAD HTM. The HTM properties have been analyzed by means of photoluminescence and conductivity experiments, which demonstrated a better hole extraction and conductivity for spiro-OMeTAD.
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