Journal
JOURNAL OF POWER SOURCES
Volume 448, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2019.227420
Keywords
pi-conjugated molecule; Energy level alignment; Charge extraction
Funding
- National Natural Science Foundation of China [51502081, G11747069]
- Science and Technique Program of Henan Province [182102210375]
- Henan Provincial Basic and Frontier Project [152300410088]
- Henan Provincial Key Science and Technology Research Projects [192102210173]
- Key Scientific Research Projects of Henan Education Department [20A140017]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Helmholtz-Zentrum Berlin fur Materialien and Energie GmbH, OCPC
- Soochow University (Chinese home organization)
- EPSRC [EP/N020863/1] Funding Source: UKRI
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A pi-conjugated small molecule N,N'-bis(naphthalen-l-yl)-N,N'+-bis(phenyl)benzidine (NPB) is introduced into a poly (bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) hole transport layer in inverted perovskite solar cells (PSCs). The NPB doping induces better perovskite crystal growth owing to a strong pi-pi interaction with PTAA and cation-pi interactions with CH3NH3+ (MA(+)). In addition, NPB doping not only improves the wettability of PTAA and regulates the perovskite crystallization to achieve a larger grain size, but also moves the valence band energy of the hole transport layer closer to the perovskite layer. Consequently, the fabricated PSCs delivered a power conversion efficiency (PCE) of 20.15%, with a short-circuit current density (J(SC)) of 22.60 mA/cm(2) and open-circuit voltage (V-OC) of 1.14 V. This outcome indicates that PTAA:NPB composite materials present great potential for fabricating high-performance PSCs.
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