| Title |
Donor-π-donor type hole transporting materials: Marked π-bridge effects on optoelectronic properties, solid-state structure, and perovskite solar cell efficiency / |
| Authors |
Paek, S ; Zimmermann, I ; Gao, P ; Gratia, P ; Rakštys, K ; Grancini, G ; Nazeeruddin, Mohammad Khaja ; Rub, Malik Abdul ; Kosa, Samia A ; Alamry, Khalid A ; Asiri, Abdullah M |
| DOI |
10.1039/c6sc01478j |
| Full Text |
|
| Is Part of |
Chemical science.. Cambridge : Royal Society of Chemistry. 2016, vol. 7, iss. 9, p. 6068-6075.. ISSN 2041-6520. eISSN 2041-6539 |
| Abstract [eng] |
Donor-π-bridge-donor type oligomers (D-π-D) have been studied intensively as active materials for organic optoelectronic devices. In this study, we introduce three new D-π-D type organic semiconductors incorporating thiophene or thienothiophene with two electron-rich TPA units, which can be easily synthesized from commercially available materials. A thorough comparison of their optoelectronic and structural properties was conducted, revealing the strong influence of the extent of longitudinal π-bridge conjugation on both the solid structure of the organic semiconductive materials and their photovoltaic performance when applied as hole transporting materials (HTM) in perovskite solar cells. Single-crystal measurements and time-resolved photoluminescence (TRPL) studies indicate that these coplanar donor-π-donor type HTMs could be promising alternatives to state-of-the-art spiro-OMeTAD, due to the multiple intermolecular short contacts as charge transporting channels and efficient charge extraction properties from the perovskite layer. The optimized devices with PEH-9 exhibited an impressive PCE of 16.9% under standard global AM 1.5 illumination with minimized hysteretic behaviour, which is comparable to that of devices using spiro-OMeTAD under similar conditions. Ambient stability after 400 h revealed that 93% of the energy conversion efficiency was retained for PEH-9, indicating that the devices had good long-term stability. |
| Published |
Cambridge : Royal Society of Chemistry |
| Type |
Journal article |
| Language |
English |
| Publication date |
2016 |
| CC license |
|
