A novel phenoxazine-based hole transport material for efficient perovskite solar cell
2015 (English)In: Journal of Energy Challenges and Mechanics, ISSN 2095-4956, E-ISSN 2056-9386, Vol. 24, no 6, 698-706 p.Article in journal (Refereed) PublishedText
Based on the previous research work in our laboratory, we have designed and synthesized a small-molecule, hole transport material (HTM) POZ6-2 using phenoxazine (POZ) as central unit and dicyanovinyl units as electron-withdrawing terminal groups. Through the introduction of a 2-ethyl-hexyl bulky chain into the POZ core unit, POZ6-2 exhibits good solubility in organic solvents. In addition, POZ6-2 possesses appropriate energy levels in combination with a high hole mobility and conductivity in its pristine form. Therefore, it can readily be used as a dopant-free HTM in perovskite solar cells (PSCs) and a conversion efficiency of 10.3% was obtained. The conductivity of the POZ6-2 layer can be markedly enhanced via doping in combination with typical additives, such as 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI). Correspondingly, the efficiency of the PSCs was further improved to 12.3% using doping strategies. Under the same conditions, reference devices based on the well-known HTM Spiro-OMeTAD show an efficiency of 12.8%.
Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 24, no 6, 698-706 p.
Dopant-free, Perovskite solar cell, Hole transport material, Phenoxazine, Thin film
Physical Sciences Chemical Sciences
IdentifiersURN: urn:nbn:se:kth:diva-180515DOI: 10.1016/j.jechem.2015.10.021ISI: 000366542300005ScopusID: 2-s2.0-84948682610OAI: oai:DiVA.org:kth-180515DiVA: diva2:894558
QC 201601152016-01-152016-01-142016-01-15Bibliographically approved