Kayunkid, Navaphun

Preferred name

Kayunkid, Navaphun

Alternative Name

Kayunkid, N.

Kayunkid, Nawapun

Main Affiliation

Integrated Innovative Technology

navaphun.ka@kmitl.ac.th

Now showing 1 - 6 of 6

Some of the metrics are blocked by your
consent settings
Simultaneous Improvement in Photovoltaic Performance and Air Stability of Perovskite Solar Cells by Controlling Molecular Orientation of Spiro-OMeTAD
(2024-07-22)
Sukgorn, Nuttaya
;
Kaewprajak, Anusit
;
Rodbuntum, Sasiphapa
;
Kayunkid, Navaphun
;
Rujisamphan, Nopporn
2,2′,7,7′-Tetrakis (N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene (Spiro-OMeTAD) is a prototypical hole transport layer (HTL) for high-performance perovskite solar cells (PSCs). Since the electric conductivity of a neat Spiro-OMeTAD film is low, the HTL is generally doped with additives to increase charge density and mobility. However, the doped Spiro-OMeTAD film suffers from moisture absorption, which deteriorates the long-term stability of PSCs. This work reports that the molecular orientation of Spiro-OMeTAD molecules in the doped HTL is vital to solving this issue. Templating the molecular arrangement of Spiro-OMeTAD by a solidifying solvent, 1,3,5-trichlorobenzene (135-TCB), forms an anisotropic film of the doped Spiro-OMeTAD and induces a face-on orientation along the surface normal. Modifying the molecular orientation enhances hole mobility in the HTL and extraction of holes at the perovskite/HTL interface. As a result, the maximum power conversion efficiency (PCE) of the PSCs increases from 17.63 to 19.92%. Besides, the air stability of the PSCs with the face-on Spiro-OMeTAD, after storage for 1000 h, is superior to that of the devices without templating the molecular arrangement of Spiro-OMeTAD by 135-TCB. Control of the molecular orientation of Spiro-OMeTAD is critical for improving PCE and air stability.
Some of the metrics are blocked by your
consent settings
Enhancing Perovskite Thin Films with Butylammonium Iodide-Lead-Tetrahydrofuran: Surface Healing and 2D Formation in Annealing-Free Single-Crystal Films for Solar Cell Applications
(2024-04-01)
Azad, Farhad
;
Supasai, Thidarat
;
Yaro, Annafi Ado
;
Soe, Kay Thi
;
Thongprong, Non
We demonstrate a functional method to achieve surface passivation and construct a two-dimensional (2D) layer on a three-dimensional (3D) perovskite, eliminating the need for subsequent annealing steps. A key process is the integration of a single methylammonium lead iodide (MAPbI<inf>3</inf>) crystal with butylammonium iodide (BAI) in tetrahydrofuran. Density functional theory calculations reveal that the synergy between BA+ cations and Pb-I octahedral structures enables the formation of a distinct 2D layered framework. MA+ and BA+ exhibit adsorption energies of −5.519 and −5.925 eV, respectively, at MA vacancies on the perovskite surface. This finding indicates that BAI passivation induces surface-healing effects, increasing surface and device stability. The I- components of BAI also replace imperfections at the perovskite interface, affording considerably reduced deep-level anomalies and mitigating nonradiative recombination. This theoretical perspective is supported experimentally via X-ray photoelectron spectroscopy and glow discharge optical emission spectroscopy. BAI passivation and 2D-BA<inf>2</inf>PbI<inf>4</inf> capping lowers work functions for 3D perovskite surfaces, registering at approximately 0.158 and 0.173 eV, respectively, which are lower than those of the control 3D film. Within the 2D/3D perovskite configuration, 2D-BA<inf>2</inf>PbI<inf>4</inf> capping considerably increases the open-circuit voltage in solar cells. In comparison, devices with BAI-enhanced interfaces show improved durability with promise for solar cell applications.
Some of the metrics are blocked by your
consent settings
Impact of a Spun-Cast MoOxLayer on the Enhanced Moisture Stability and Performance-Limiting Behaviors of Perovskite Solar Cells
(2021-04-26)
Rosungnern, Unyamanee
;
Kumnorkaew, Pisist
;
Kayunkid, Navaphun
;
Chanlek, Narong
;
Li, Youyong
Organic-inorganic perovskite solar cells (PSCs), which have good environmental durability, are of great interest for practical applications. In this work, we show that a solution-processed MoOx layer acts as a buffer layer against high moisture stress to suppress defects in the perovskite and as a hole transport layer. The inversion of the photoinduced charge migration behaviors, that is, the electron preferentially moving toward the surface when MoOx is directly deposited onto the perovskite, is found to cause a significant loss in device functionality. The deposition of MoOx onto spiro-OMeTAD results in a lower photocurrent density-voltage (J-V) hysteresis behavior, a greatly enhanced electrical conductivity, and a significantly stabilized power conversion efficiency (PCE) when compared with those of devices without the MoOx layer. More importantly, the PCEs of the MoOx-based devices are retained at over 85% of their initial value, while only 75% is retained for a reference cell. This work highlights the facial fabrication approach of the solution-based MoOx layer and provides experimental evidence of the photogenerated charge migration behaviors on the perovskite/MoOx interface. This information would be beneficial for the further design and development of PSC technology.
Some of the metrics are blocked by your
consent settings
Unveiling the Influence of the Spectral Irradiance of Indoor Light-Emitting Diodes on the Photovoltaics of a Methylammonium Lead Iodide-Based Device
(2022-01-01)
Supasai, Thidarat
;
Soe, Kay Thi
;
Smerchit, Thapanut
;
Azad, Farhad
;
Thongprong, Non
An understanding of the spectrum–property relationship of perovskite solar cells when illuminated by light-emitting diodes that are used for indoor applications is necessary. Herein, it is aimed to explore the influences of correlated-color temperatures on a MAPbI<inf>3</inf>-based device under low-light conditions. Given an irradiance of approximately 3 W m−2 (or ≈1000 lx), a maximum free carrier generation rate of 1.0 × 1021 m−3 s−1 was found. Additionally, power conversion efficiencies (PCEs) up to 31.97%, 30.36%, and 28.98% with maximum power outputs of 13.66, 13.02, and 16.09 μW could be reached at 3000, 4000, and 6500 K, respectively. Additional increases in the PCEs were observed when high-energy blue light (in a range of 400–550 nm) was excluded during the current–voltage sweeps. In combination with the surface photovoltage measurements, intense blue light (under 6500 K) had a minimal influence on the photoinduced charge separation signals when compared to those caused by 3000 and 4000 K light. As a solar cell, the PCE reached as high as 34.52%, which corresponded to 73.08% of the thermodynamic limit of its bandgap at 3000 K.
Some of the metrics are blocked by your
consent settings
Cesium Moderation and Structural Transformation on α-CsPbI2Br Perovskite Durability via Cation Retarding Migration: A Combined Simulation and Experimental Study
(2025-03-01)
Henjongchom, Nakorn
;
Ruengsrisang, Waranchit
;
Soe, Kay Thi
;
Kayunkid, Navaphun
;
Thongprong, Non
Preliminary density functional theory studies suggest that cesium-ion (Cs+) migration possesses a low energy barrier at defective surfaces, which potentially induces lattice distortion of α-CsPbI<inf>2</inf>Br perovskites. Herein, we introduced surface design via mixed-cation and mixed-halide methods to enhance the durability and functionality of all-inorganic CsPbI<inf>2</inf>Br solar cells. The adsorption and adhesion energies indicate that formamidinium bromide (FABr) passivation creates a nonbonding surface with resistance to water molecules and induces lattice reconstruction at the surface into a cubic-like structure. Experimental validation in solar cell applications reveals that nonencapsulated formamidinium bromide − based devices can retain 84 % of the initial efficiency (13.29 %) after 336 h of use with 40 %–43 % of relative humidity, outperforming the reference cell that retained 20 % of the original efficiency (10.31 %) after 144 h. This findings highlight the dual role of FABr passivation in stabilizing the surface and reorganizing the lattice structure, contributing to significantly enhanced durability and performance CsPbI<inf>2</inf>Br solar cells.
Some of the metrics are blocked by your
consent settings
NiO Nanoparticle-Modified PTAA Hole Transport Layers for High-Efficiency and Stable Large-Area Perovskite Solar Cells
(2026-06-22)
Sukgorn, Nuttaya
;
Kaewprajak, Anusit
;
Lapawae, Komsun
;
Sinthiptharakoon, Kitiphat
;
Treetong, Alongkot
The hole transport layer (HTL) plays a central role in governing charge extraction, efficiency, and long-term stability in perovskite solar cells (PSCs). Although poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] (PTAA) is widely used as an organic HTL, its limited hole mobility and thermal robustness restrict device durability and scalability. Here, we report a hybrid organic−inorganic HTL formed by incorporating NiO nanoparticles into PTAA to simultaneously improve charge transport and thermal stability. Comprehensive spectroscopic and electrical analyses reveal that NiO incorporation deepens the valence band position, enhances hole mobility, accelerates interfacial hole extraction, and suppresses carrier recombination in PTAA:NiO films. As a result, planar n−i−p PSCs employing PTAA:NiO (10 mg mL−1) achieve a champion power conversion efficiency (PCE) of 20.76%, outperforming pristine PTAA-based devices (19.50%) while retaining 86.5% of their initial efficiency after 6000 h under ISOS-D-1 storage conditions. Importantly, NiO incorporation also improves module-level robustness by mitigating thermally induced interfacial degradation during high-temperature encapsulation. Scalable 10 × 10 cm2 minimodules deliver a PCE of up to 14.18% and retain 85.1% of their initial performance after 5000 h. Furthermore, integrated minimodules successfully powered a standalone PM2.5 monitoring system under indoor illumination, highlighting the practical potential of hybrid-HTL PSCs for durable large-area photovoltaic and low-power Internet-of-Things applications.

Kayunkid, Navaphun

Filters

Settings

Sort By

Results per page