Hanyang University · Engineering
Professor Hansol Park's research lab specializes in advanced optoelectronic materials and devices, with a primary focus on perovskite-based solar cells and piezoelectric thin films. The lab explores innovative materials design—particularly in hole and electron transport materials, interfacial engineering, and defect passivation—to enhance power conversion efficiency and long-term stability in perovskite photovoltaics. A key research direction involves molecular engineering of organic semiconductors and inorganic oxides for tailored energy level alignment and built-in potential enhancement. The lab also investigates epitaxial thin-film growth of functional oxides, such as PbTiO₃, for next-generation piezoelectric and ferroelectric applications at low-temperature processes.
Figures are computed from collected data and may differ slightly.
Organic–inorganic perovskite solar cells (PSCs) have shown tremendous progress from 3.8% power conversion efficiency (PCE) in 2003 to 25.2% in 2020 because of their wide range of light absorption, fast charge separation, long carrier diffusion length, and long carrier lifetime. The optoelectronic characteristics of hole transport material (HTM) and electron transport material (ETM) strongly affect photovoltaic (PV) performance and stability of PSCs. Recently, various inorganic HTMs with high eff
In this work, we introduce a bicomponent hole-transport layer, composed of inorganic NiO<sub><i>x</i></sub> and a donor-acceptor-donor (D-A-D)-structured organic small molecule, for p-i-n planar perovskite photovoltaic (PV) cells. The newly designed D-A-D organic hole-transporting material (HTM), (4',4‴-(1,3,4-oxadiazole-2,5-diyl)bis(<i>N</i>,<i>N</i>-bis(4-methoxyphenyl)-[1,1'-biphenyl]-4-amine)), is shown to be an efficient HTM without a dopant, and methoxy functional units, further introduced
Abstract Intrinsic characteristics of organic semiconductor‐based hole transport materials (HTMs) such as facile synthesizability, energy level tunability, and charge transport capability have been highlighted as crucial factors determining the performances of perovskite photovoltaic (PV) cells. However, their properties in the excited state have not been actively studied, although PVs are operated under solar illumination. Here, the characteristics of organic HTMs in their excited state such as
Wide-bandgap perovskite solar cells (PSCs) with high open-circuit voltage (V<sub>oc</sub>) represent a compelling and emerging technological advancement in high-performing perovskite-based tandem solar cells. Interfacial engineering is an effective strategy to enhance V<sub>oc</sub> in PSCs by tailoring the energy level alignments between the constituent layers. Herein, n-type quinoxaline-phosphine oxide-based small molecules with strong dipole moments is designed and introduce them as effective
Abstract We have succeeded in obtaining thin-film single crystals of PbTiO 3 (PT) piezoelectrics on a Si single crystal with a few defects in the film at the extremely low temperature of 450 °C, which was considered difficult in the past. We confirmed that the obtained thin film demonstrates dielectric characteristics (lattice constant: a = 0.3904 nm, c = 0.4159 nm; relative dielectric constant: 120), along with an extremely high residual polarization value (Pr = 85 μ C cm −2 ). A martensitic tr
Abstract Tandem solar cells offer a pathway beyond the Shockley–Queisser limit of single‐junction devices. Among these, all‐perovskite tandems are especially appealing for their low cost and facile fabrication. However, non‐radiative recombination at the interfaces between perovskite absorbers and charge‐transport layers continues to impede their translation from theoretical potential to experimental realization. Here, we develop a molecular‐design strategy for dual interface engineering of the
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