Journal
SMALL
Volume 15, Issue 49, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201904715
Keywords
dopant-free; hole transporting materials; inverted planar structure; perovskite solar cells
Categories
Funding
- National Key RAMP
- D Program of China [2017YFA0204704]
- National Science Foundation of China [21673109, 21722302, 51773091, 61604069, 61761136013]
- Natural Science Foundation of Jiangsu Province [BK20171465]
- Thousand Talents Program of China
- Shenzhen Science, Technology and Innovation Commission [JCYJ20180305180645221]
- Shenzhen Peacock Team Project [KQTD2016030111203005]
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A new hole transporting material (HTM) named DMZ is synthesized and employed as a dopant-free HTM in inverted planar perovskite solar cells (PSCs). Systematic studies demonstrate that the thickness of the hole transporting layer can effectively enhance the morphology and crystallinity of the perovskite layer, leading to low series resistance and less defects in the crystal. As a result, the champion power conversion efficiency (PCE) of 18.61% with J(SC) = 22.62 mA cm(-2), V-OC = 1.02 V, and FF = 81.05% (an average one is 17.62%) is achieved with a thickness of approximate to 13 nm of DMZ (2 mg mL(-1)) under standard global AM 1.5 illumination, which is approximate to 1.5 times higher than that of devices based on poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonic acid) (PEDOT:PSS). More importantly, the devices based on DMZ exhibit a much better stability (90% of maximum PCE retained after more than 556 h in air (relative humidity approximate to 45%-50%) without any encapsulation) than that of devices based on PEDOT:PSS (only 36% of initial PCE retained after 77 h in same conditions). Therefore, the cost-effective and facile material named DMZ offers an appealing alternative to PEDOT:PSS or polytriarylamine for highly efficient and stable inverted planar PSCs.
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