π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices

JOURNAL OF POWER SOURCES

卷:448

Article

Liu, Hui¹  Liu, Hai-Rui¹  Yang, Feng¹  Yang, Ji-En¹  Song, Jian¹  Li, Meng^2,3  Li, Zhe⁴  Tsoi, Wing Chung⁵  Eze, Martin Chinweokwu⁴  Liu, Zhi-Yong¹  Ma, Heng¹  Gao, Min⁴  Wang, Zhao-Kui² 

[1] Henan Normal Univ, Coll Phys & Mat Sci, Henan Key Lab Photovolta Mat, Xinxiang 453007, Henan, Peoples R China

[2] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China

[3] Helmholtz Zentrum Berlin Mat & Energie, Lab Adv Optoelect Mat, Kekulestr 5, D-12489 Berlin, Germany

[4] Cardiff Univ, Sch Engn, Cardiff CF24 3AA, Wales

[5] Swansea Univ Bay Campus, Coll Engn, Fabian Way, Swansea SA1 8EN, W Glam, Wales

关键词: pi-conjugated molecule;    Energy level alignment;    Charge extraction;   

DOI  :  10.1016/j.jpowsour.2019.227420

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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