Smallest Organic Spacers-Based Ruddlesden-Popper and Dion-Jacobson Perovskites: Which One Is Better for Optoelectronics?
Journal of Physical Chemistry C(2023)
摘要
In this work, the smallest and analogous organic spacers "ethylammonium" (EA) and "ethylenediammonium" (EDA) are incorporated in MAPbI(3) to form RP-EA and DJ-EDA perovskites (n = 1-4), respectively, in order to compare their structural, morphological, optical, and optoelectronic properties, which revealed significantly different characteristics of both perovskite phases. Effective high frequency dielectric constants (epsilon(eff)) of RP-EA and DJ-EDA are correlated with their optical properties, which show that the large difference between the epsilon(eff)'s of DJ-EDA (9.62; n = 1 to 7.58; n = 4) and MAPbI(3) (6.5) is responsible for sharp exciton absorbance peaks in DJ-EDA perovskites. Compared to RP-EA, the DJ-EDA perovskites showed improved stability and a higher photoresponsivity of similar to 1.00 mA/W (n = 4) and retained 97.67% (n = 2) of the initial photocurrent after 50 cycles of transient photocurrent under 1 sun illumination (100 mW/cm(2)) performed under ambient atmosphere conditions owing to their van der Waals gap free structure. On the other hand, RP-EA perovskites possess relatively fast response times which are attributed to better band alignment and in-plane morphology. Our results provide fundamental insights about the structural and photophysical properties of the smallest carbon chain organic spacer-based RP and DJ perovskites, and these findings are crucial in order to find a suitable replacement of bulk perovskites for commercial PV applications.
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关键词
dion–jacobson perovskites,optoelectronics,spacers-based
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