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Article: Dopant‐Free Small‐Molecule Hole‐Transporting Material for Inverted Perovskite Solar Cells with Efficiency Exceeding 21%

TitleDopant‐Free Small‐Molecule Hole‐Transporting Material for Inverted Perovskite Solar Cells with Efficiency Exceeding 21%
Authors
Keywordsdevice stability
donor–acceptor small molecules
dopant‐free hole‐transporting materials
inverted perovskite solar cells
Issue Date2019
PublisherWILEY-VCH Verlag GmbH. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2089
Citation
Advanced Materials, 2019, v. 31 n. 35, p. article no. 1902781 How to Cite?
AbstractHole‐transporting materials (HTMs) play a critical role in realizing efficient and stable perovskite solar cells (PVSCs). Considering their capability of enabling PVSCs with good device reproducibility and long‐term stability, high‐performance dopant‐free small‐molecule HTMs (SM‐HTMs) are greatly desired. However, such dopant‐free SM‐HTMs are highly elusive, limiting the current record efficiencies of inverted PVSCs to around 19%. Here, two novel donor–acceptor‐type SM‐HTMs (MPA‐BTI and MPA‐BTTI) are devised, which synergistically integrate several design principles for high‐performance HTMs, and exhibit comparable optoelectronic properties but distinct molecular configuration and film properties. Consequently, the dopant‐free MPA‐BTTI‐based inverted PVSCs achieve a remarkable efficiency of 21.17% with negligible hysteresis and superior thermal stability and long‐term stability under illumination, which breaks the long‐time standing bottleneck in the development of dopant‐free SM‐HTMs for highly efficient inverted PVSCs. Such a breakthrough is attributed to the well‐aligned energy levels, appropriate hole mobility, and most importantly, the excellent film morphology of the MPA‐BTTI. The results underscore the effectiveness of the design tactics, providing a new avenue for developing high‐performance dopant‐free SM‐HTMs in PVSCs.
Persistent Identifierhttp://hdl.handle.net/10722/274003

 

DC FieldValueLanguage
dc.contributor.authorWang, Y-
dc.contributor.authorChen, W-
dc.contributor.authorWang, L-
dc.contributor.authorTu, B-
dc.contributor.authorChen, T-
dc.contributor.authorLiu, B-
dc.contributor.authorYang, K-
dc.contributor.authorKoh, CW-
dc.contributor.authorZhang, X-
dc.contributor.authorSun, H-
dc.contributor.authorChen, G-
dc.contributor.authorFeng, X-
dc.contributor.authorWoo, HY-
dc.contributor.authorDjurisic, AB-
dc.contributor.authorHe, Z-
dc.contributor.authorGuo, X-
dc.date.accessioned2019-08-18T14:53:06Z-
dc.date.available2019-08-18T14:53:06Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Materials, 2019, v. 31 n. 35, p. article no. 1902781-
dc.identifier.urihttp://hdl.handle.net/10722/274003-
dc.description.abstractHole‐transporting materials (HTMs) play a critical role in realizing efficient and stable perovskite solar cells (PVSCs). Considering their capability of enabling PVSCs with good device reproducibility and long‐term stability, high‐performance dopant‐free small‐molecule HTMs (SM‐HTMs) are greatly desired. However, such dopant‐free SM‐HTMs are highly elusive, limiting the current record efficiencies of inverted PVSCs to around 19%. Here, two novel donor–acceptor‐type SM‐HTMs (MPA‐BTI and MPA‐BTTI) are devised, which synergistically integrate several design principles for high‐performance HTMs, and exhibit comparable optoelectronic properties but distinct molecular configuration and film properties. Consequently, the dopant‐free MPA‐BTTI‐based inverted PVSCs achieve a remarkable efficiency of 21.17% with negligible hysteresis and superior thermal stability and long‐term stability under illumination, which breaks the long‐time standing bottleneck in the development of dopant‐free SM‐HTMs for highly efficient inverted PVSCs. Such a breakthrough is attributed to the well‐aligned energy levels, appropriate hole mobility, and most importantly, the excellent film morphology of the MPA‐BTTI. The results underscore the effectiveness of the design tactics, providing a new avenue for developing high‐performance dopant‐free SM‐HTMs in PVSCs.-
dc.languageeng-
dc.publisherWILEY-VCH Verlag GmbH. The Journal's web site is located at http://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2089-
dc.relation.ispartofAdvanced Materials-
dc.subjectdevice stability-
dc.subjectdonor–acceptor small molecules-
dc.subjectdopant‐free hole‐transporting materials-
dc.subjectinverted perovskite solar cells-
dc.titleDopant‐Free Small‐Molecule Hole‐Transporting Material for Inverted Perovskite Solar Cells with Efficiency Exceeding 21%-
dc.typeArticle-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adma.201902781-
dc.identifier.pmid31292989-
dc.identifier.scopuseid_2-s2.0-85068778825-
dc.identifier.hkuros301773-
dc.identifier.volume31-
dc.identifier.issue35-
dc.identifier.spagearticle no. 1902781-
dc.identifier.epagearticle no. 1902781-

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