期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 46, 页码 51744-51755出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c16514
关键词
perovskite solar cells; 2D perovskite materials; propargylamine organic spacer; Pb(SCN)(2) process additives; efficiency and stability
资金
- National Science Foundation [ECCS/EPMD1903303]
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0292]
Compared to three-dimensional (3D) organic-inorganic hybrid perovskites, two-dimensional (2D) ones possess great possibilities to realize stable cost-effective perovskite solar cells (PSCs). However, studies indicated that PSCs with 2D perovskites exhibited poor power conversion efficiencies (PCEs). In this study, we report novel propargylamine cation (PPA(+))-based quasi-2D perovskites. PPA(+) employed as an organic spacer is for enhancing charge-carrier transport of quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin films, consequently boosting PCEs of PSCs. To further boost PCEs of PSCs with quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin films, a quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film is processed with Pb(SCN)(2) additives. Systematical studies indicate that the quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film processed with Pb(SCN)(2) additives exhibits superior film morphology and crystallinity, larger crystals, reduced nonradiative charge-carrier recombination, and enhanced and balanced charge-carrier mobilities compared to the pristine quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film. As a result, PSCs with the quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film processed with Pb(SCN)(2) additives exhibit a PCE of 15.20%, which is an over 25% enhancement compared to those (12.16%) with a pristine quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film. In addition, PSCs with the quasi-2D (PPA)(2)(CH3NH3)(2)Pb3I10 thin film processed with Pb(SCN)(2) additives possess dramatically suppressed photocurrent hysteresis and significantly boosted stability. All these results indicate that we have developed a facile way to synthesize novel 2D perovskite thin films for realizing stable and efficient PSCs with dramatically suppressed photocurrent hysteresis.
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