Honors & Awards


  • Baker Fellowship, Stanford PRISM (2022-Date)

Boards, Advisory Committees, Professional Organizations


  • Committee Member, Provostial Search Advisory Committee (2023)
  • Committee Member, Graduate Student and Postdoctoral Advisory Committee (VPGE) (2023 - Present)

Professional Education


  • Ph.D., Dartmouth College, Chemistry (2021)
  • M.A., Wesleyan University, Chemistry (2013)
  • B.A., Wesleyan University, Chemistry (2012)

Stanford Advisors


All Publications


  • Suppressing Phase Transitions and High-Pressure Amorphization through Tethered Organic Cations in Organochalcogenide-Halide Perovskites. Journal of the American Chemical Society Li, J., Hofmann, J., Stolz, R. M., Wen, J., Deschene, C. R., Bartels, H., Liu, Z., Salleo, A., Lin, Y., Chapman, K. W., Karunadasa, H. I. 2025

    Abstract

    Polymorphism, where the same composition adopts different structures, is abundant in perovskites, with numerous phase transitions occurring as a function of temperature and pressure. The APbX3 perovskites (A = monovalent cation; X = Cl-, Br-, I-) show such phase transitions near ambient conditions, significantly impacting their optoelectronic device performance and stability. Herein, we show that the recently reported organochalcogenide-halide perovskites (RCh)PbX2 (RCh = +NH3(CH2)2S-, +NH3(CH2)2Se-; X = Cl-, Br-) featuring an organic A-site cation that is covalently linked to the inorganic framework, show no phase transitions with temperature from 4 to 423 K and with pressure from 0 to 40 GPa. Furthermore, the RCh-perovskites remain crystalline even at 40 GPa, in striking contrast to AMX3 (M = Pb, Sn) perovskites that rapidly become amorphous at pressures above ca. 5 GPa. By alloying RCh or the similar-sized ethylammonium as impurities into a (CH3NH3)PbBr3 host, we find that the enhanced phase integrity of the RCh-perovskites may be attributed mostly to the covalent attachment of the A-site cation, which impedes octahedral tilting, a primary avenue for phase transitions. We also track the rotational isomerization of the RCh ligands with pressure, finding that the trans-to-gauche isomerization enables a shrinking A-site cavity volume, without drastic changes to the inorganic framework. Unlike the dynamic disorder seen in hybrid perovskite A-site cations, this static rotational isomerism appears to be unaffected by temperature from 93 to 373 K. The exceptional structural integrity of the RCh-perovskites motivates the design of similar strategies to impede phase transitions in technologically important perovskite compositions.

    View details for DOI 10.1021/jacs.5c03696

    View details for PubMedID 40377980

  • Mechanistic Insight into the Formation and Deposition of Conductive, Layered Metal-Organic Framework Nanocrystals ACS NANO Ambrogi, E. K., Damacet, P., Stolz, R. M., Mirica, K. A. 2024

    Abstract

    This paper describes the use of the layered conductive metal-organic framework (MOF) (nickel)3-(hexahydroxytriphenylene)2 [Ni3(HHTP)2] as a model system for understanding the process of self-assembly within this class of materials. We confirm and quantify experimentally the role of the oxidant in the synthetic process. Monitoring the deposition of Ni3(HHTP)2 with in situ infrared spectroscopy revealed that MOF formation is characterized by an initial induction period, followed by linear growth with respect to time. The presence and identity of oxidizing agents is critical for the coordination-driven self-assembly of these materials and impacts both the length of the induction period and the observed rate of MOF growth. A large excess of hydrogen peroxide results in a 2× increase in the observed deposition rate (9.6 ± 6.8 × 10-4 vs 5.0 ± 2.8 × 10-4 min-1) over standard reaction conditions, but leads to the formation of large, irregularly shaped particles. Slower deposition rates in the presence of oxygen favor the formation of uniformly sized nanorods (98 ± 38 × 25 ± 6 nm). These quantitative insights into the mechanism of HHTP-based MOF formation provide valuable information about the fundamental aspects of coordination and polymerization that are critical for nanoscale crystal engineering of structure-property relationships in this class of materials.

    View details for DOI 10.1021/acsnano.4c14018

    View details for Web of Science ID 001382619000001

    View details for PubMedID 39719031