Doyun Im

Tailoring Light Management in All‐Perovskite Tandem Solar Cells: The Impact of Nanotextures

Sebastian Berwig, Yeonghun Yun, Doyun Im, Isabella Taupitz et autres

ABSTRACT All‐perovskite tandem solar cells (APTSCs) emerge as promising low‐cost and high‐efficiency next‐generation photovoltaics. To further increase the power conversion efficiencies (PCEs), a deeper understanding and fine‐tuned optimization of the optics is required, since most reports fall below 90% of the theoretical …

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Author response for "Why More Junctions Do Not Yet Deliver: Interconnection Challenges in Perovskite Multijunction Solar Cells"

Rik Hooijer, Sunwoo Kim, Doyun Im, Cong Chen et autres

Synthetic Surface Design of Transparent Electrodes for Enhanced Molecular Contact in Perovskite Solar Cells

Rik Hooijer, Sunwoo Kim, Sinja Klenk, Hao Zhu et autres

ABSTRACT Self‐assembled molecules (SAMs) as a molecular charge selective contact and interface with metal oxides are the new benchmark in p‐i‐n devices. Yet, transparent electrode (i.e., ITO) surface preparation is often performed with established protocols that do not exploit the full potential …

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Selective Ion‐Blocking Strategy for Stabilizing Perovskite Tandem Solar Cells

Sunwoo Kim, Hangyeol Choi, Doyun Im, Yeonghun Yun et autres

ABSTRACT Wide‐bandgap (WBG) perovskite solar cells employing iodide‐bromide mixed halide compositions are essential for tandem integration but suffer from open‐circuit voltage ( V OC ) losses and photo‐instability. Lithium fluoride (LiF) interlayers are widely adopted to enhance V OC via interfacial defect …

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Monolithic Integration of Redox-Stable Sn–Pb Halide Perovskite Single-Crystalline Films for Durable Near-Infrared Photodetection

Rajendra Kumar Gunasekaran, Jihoon Nam, Myeong-geun Choi, Won Chang Choi et autres

Abstract Tin–lead (Sn–Pb) halide perovskite single crystals combine narrow bandgaps, long carrier diffusion lengths, and low trap densities, positioning them as ideal candidates for near-infrared (NIR) optoelectronics. However, conventional growth strategies rely on bulk crystallization at elevated temperatures, leading to uncontrolled nucleation, …

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Why more junctions do not yet deliver: interconnection challenges in perovskite multijunction solar cells

Rik Hooijer, Sunwoo Kim, Doyun Im, Cong Chen et autres

Single-junction photovoltaic technologies are approaching their practical efficiency limits. Perovskite-based multijunction solar cells offer a path beyond these limits through reduced thermalization losses and improved spectral utilization. Although tandem architectures are not new to the photovoltaic community, perovskite-based tandems have, for the …

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Recent Advances in Modulating the Crystallization Dynamics of Sn–Pb Mixed Perovskites for High‐Efficiency All‐Perovskite Tandem Solar Cells

Doyun Im, Wonchang Choi, Gill Sang Han, Sang-Wook Lee

A deep understanding of Sn-Pb mixed perovskites is critical for the development of highly efficient all-perovskite tandem solar cells that surpass the radiative efficiency limits of single-junction devices. However, the rapid crystallization and intrinsic instability of Sn-Pb mixed perovskites often lead to …

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Artificial intelligence high-throughput prediction building dataset to enhance the interpretability of hybrid halide perovskite bandgap

Wenning Chen, Jungchul Yun, Doyun Im, Sijia Li et autres

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Inside Front Cover Image

Yeonghun Yun, Devthade Vidyasagar, Sunwoo Kim, Sung Woong Yang et autres

All‐perovskite tandem solar cell: a cutting‐edge technology designed for efficient and sustainable terrestrial and space energy generation. image

Simultaneous passivation of surface and bulk defects in all‐perovskite tandem solar cells using bifunctional lithium salts

Yeonghun Yun, Devthade Vidyasagar, Sunwoo Kim, Sung Woong Yang et autres

Abstract All‐perovskite tandem solar cells have garnered considerable attention because of their potential to outperform single‐junction cells. However, charge recombination losses within narrow‐bandgap (NBG) perovskite subcells hamper the advancement of this technology. Herein, we introduce a lithium salt, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), for …

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Ferromagnetic Nickel as a Sustainable Reducing Agent for Tin–Lead Mixed Perovskite in Single‐Junction and Tandem Solar Cells

Doyun Im, Passarut Boonmongkolras, Yeonghun Yun, Sung Woong Yang et autres

Abstract Narrow‐bandgap (NBG) Sn–Pb mixed perovskite solar cells (PSCs) represent a promising solution for surpassing the radiative efficiency of single‐junction solar cells. The unique bandgap tunability of halide perovskites enables optimal tandem configurations of wide‐bandgap (WBG) and NBG subcells. However, these devices …

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A Recyclable Reducing Agent to Minimize Sn4+ in Pb-Sn Mixed Perovskite Precursor Solution for Sustainable All-Perovskite Tandem Solar Cells

Boonmongkolras Passarut, Sung Woong Yang, Sunwoo Kim, Jungchul Yun et autres

With the increasing demand of high efficiency solar cells, all-perovskite tandem solar cells have spotlighted. However, power conversion efficiency (PCE) of all-perovskite tandem solar cells suffer from the charge carrier losses of Pb-Sn perovskite, which are induced from the Sn2+ oxidation. In …