| Title |
Interfacial versus bulk properties of hole-transporting materials for perovskite solar cells: isomeric triphenylamine-based enamines versus spiro-OMeTAD |
| Authors |
Simokaitiene, Jurate ; Cekaviciute, Monika ; Baucyte, Kristina ; Volyniuk, Dmytro ; Durgaryan, Ranush ; Molina, Desiré ; Yang, Bowen ; Suo, Jiajia ; Kim, YeonJu ; Filho, Demetrio Antonio da Silva ; Hagfeldt, Anders ; Sini, Gjergji ; Grazulevicius, Juozas V |
| DOI |
10.1021/acsami.1c03000 |
| Full Text |
|
| Is Part of |
ACS Applied materials and interfaces.. Washington, DC : American Chemical Society. 2021, vol. 13, iss. 18, p. 21320-21330.. ISSN 1944-8244. eISSN 1944-8252 |
| Keywords [eng] |
enamine ; hole mobility ; perovskite solar cell ; spiro-OMeTAD ; time of flight ; triphenylamine |
| Abstract [eng] |
Here, we report on three new triphenylamine-based enamines synthesized by condensation of an appropriate primary amine with 2,2-diphenylacetaldehyde and characterized by experimental techniques and density functional theory (DFT) computations. Experimental results allow highlighting attractive properties including solid-state ionization potential in the range of 5.33-5.69 eV in solid-state and hole mobilities exceeding 10-3 cm2/V·s, which are higher than those in spiro-OMeTAD at the same electric fields. DFT-based analysis points to the presence of several conformers close in energy at room temperature. The newly synthesized hole-transporting materials (HTMs) were used in perovskite solar cells and exhibited performances comparable to that of spiro-OMeTAD. The device containing one newly synthesized hole-transporting enamine was characterized by a power conversion efficiency of 18.4%. Our analysis indicates that the perovskite-HTM interface dominates the properties of perovskite solar cells. PL measurements indicate smaller efficiency for perovskite-to-new HTM hole transfer as compared to spiro-OMeTAD. Nevertheless, the comparable power conversion efficiencies and simple synthesis of the new compounds make them attractive candidates for utilization in perovskite solar cells. |
| Published |
Washington, DC : American Chemical Society |
| Type |
Journal article |
| Language |
English |
| Publication date |
2021 |
| CC license |
|
