Hexamethylenetetramine-mediated growth of grain-boundary-passivation CH3NH3PbI3 for highly reproducible and stable perovskite solar cells

JOURNAL OF POWER SOURCES

卷:377

Article

Zheng, Yan-Zhen^1,2  Li, Xi-Tao¹  Zhao, Er-Fei¹  Lv, Xin-Ding¹  Meng, Fan-Li¹  Peng, Chao³  Lai, Xue-Sen¹  Huang, Meilan³  Cao, Guozhong⁴  Tao, Xia¹  Chen, Jian-Feng² 

[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, 15 Beisanhuan East Rd, Beijing 100029, Peoples R China

[2] Beijing Univ Chem Technol, Minist Educ High Grav Engn & Technol, Res Ctr, 15 Beisanhuan East Rd, Beijing 100029, Peoples R China

[3] Queens Univ Belfast, Sch Chem & Chem Engn, Belfast, Antrim, North Ireland

[4] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

关键词: Perovskite solar cell;    Hexamethylenetetramine;    Grain-boundary-passivation;    Stability;    DFT calculation;   

DOI  :  10.1016/j.jpowsour.2017.12.011

来源: Elsevier

【 摘 要 】

Simultaneously achieving the long-term device stability and reproducibility has proven challenging in perovskite solar cells because solution-processing produced perovskite film with grain boundary is sensitive to moisture. Herein, we develop a hexamethylenetetramine (HMTA)-mediated one-step solution-processing deposition strategy that leads to the formation of high-purity and grain-boundary-passivation CH3NH3PbI3 film and thereby advances cell optoelectronic performance. Through morphological and structural characterizations and theoretical calculations, we demonstrate that HMTA fully occupies the moisture-exposed surface to build a bridge across grain boundary and coordinates with Pb ions to inhibit the formation of detrimental PbI2. Such HMTA-mediated grown CH3NH3PbI3 films achieves a decent augmentation of power conversion efficiency (PCE) from 12.70% to 17.87%. A full coverage of PbI2-free CH3NH3PbI3 surface on ZnO also boosts the device's stability and reproducibility.

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