Unraveling Loss Mechanisms Arising from Energy‐Level Misalignment between Metal Halide Perovskites and Hole Transport Layers

Advanced Functional Materials, Год журнала: 2024, Номер 34(30)

Опубликована: Апрель 3, 2024

Abstract Metal halide perovskites are promising light absorbers for multijunction photovoltaic applications because of their remarkable bandgap tunability, achieved through compositional mixing on the site. However, poor energy‐level alignment at interface between wide‐bandgap mixed‐halide and charge‐extraction layers still causes significant losses in solar‐cell performance. Here, origin such is investigated, focusing misalignment valence band maximum highest occupied molecular orbital (HOMO) a commonly employed combination, FA 0.83 Cs 0.17 Pb(I 1‐x Br x ) 3 with bromide content ranging from 0 to 1, poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine] (PTAA). A combination time‐resolved photoluminescence spectroscopy numerical modeling charge‐carrier dynamics reveals that open‐circuit voltage (V OC associated rising derive increasing accumulation holes HOMO PTAA, which then subsequently recombine non‐radiatively across via interfacial defects. Simulations assuming an ideal choice hole‐transport material pair show V originating can be reduced by up 70 mV. These findings highlight urgent need tailored materials exhibiting improved enable solar cells power conversion efficiencies.

Язык: Английский

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Advancing Efficiency and Stability of Lead, Tin, and Lead/Tin Perovskite Solar Cells: Strategies and Perspectives

Solar RRL, Год журнала: 2023, Номер 7(21)

Опубликована: Авг. 22, 2023

Halide‐perovskite‐based solar cells (HPSCs) have established themselves as a promising photovoltaic (PV) technology in remarkably short time. The rapid improvement HPSCs can be attributed to the unique material and optoelectronic properties of metal halide perovskite semiconductors coupled with very knowledgeable experienced PV community. This review briefly summarizes chemistry perovskites, delving into fundamental aspects crystal structure optical bandgap, followed by more in‐depth report on advancements efficiencies, thanks structural regulation, interfacial modulation, thin‐film engineering. It is mainly focused three perovskites topics: 1) high‐performance Pb‐based 2) Sn‐based their associated challenges, 3) emerging work mixed composition Pb–Sn perovskites. For each these domains, effects stemming from tuning monovalent A‐site site are examined. Additionally, various approaches aimed at passivating defects bulk film interface, along carrier transport engineering, discussed. discussions also encompass broader implications for device performance, stability, toxicity. Finally, perspectives future directions commercial feasibility technologies provided.

Язык: Английский

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Crystallization Enhancement and Ionic Defect Passivation in Wide‐Bandgap Perovskite for Efficient and Stable All‐Perovskite Tandem Solar Cells

Advanced Functional Materials, Год журнала: 2023, Номер 34(7)

Опубликована: Ноя. 5, 2023

Abstract By integrating wide‐bandgap (WBG) and narrow‐bandgap perovskites, monolithic all‐perovskite tandem solar cells have garnered significant attention as a prospective strategy for surpassing the efficiency limits of single‐junction cells. However, WBG subcells, which significantly impact performance operational stability cells, face notable challenges associated with pronounced nonradiative recombination losses limited film photostability. Here, an efficient method is reported by adding potassium hypophosphite into perovskite precursor solution to simultaneously regulate crystallization passivate ionic defects in perovskites. This approach results high‐quality films improves photostability The devices 1.79 eV bandgap achieve champion power conversion (PCE) 20.06% open‐circuit voltage 1.32 V. retain ≈96% their initial PCE following 913 h continuous AM 1.5 G illumination. With these are fabricated 26.08%.

Язык: Английский

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Achieving Low Cost and High Performance Flexible CsPbIBr₂ Perovskite Photodetectors Arrays with Imaging System via Dual Interfacial Optimization and Structural Design

Advanced Optical Materials, Год журнала: 2024, Номер 12(17)

Опубликована: Март 14, 2024

Abstract All‐inorganic metal halide perovskites are competitive candidate as next‐generation flexible photodetectors (PDs) materials due to the remarkable photoelectric properties, enhanced heat stability, and mechanical flexibility. However, constructing low‐cost PDs with high photodetection performance, good operation stability robustness, manufacturing corresponding array have been a challenge. Herein, PbCl 2 Zinc(II) Dibenzyldithiocarbamate (Zn(DBDTC) ) employed modify bottom top interface of CsPbIBr perovskite layer, respectively, passivate surface trap state, enhance hydrophobicity resist phase segregation, improve contact. Consequently, self‐powered champion Bi Te 3 electrode reach responsivity 0.38 A W −1 maximum detectivity 3.44 × 10 13 Jones at 570 nm, maintain outstanding long‐term operational without additional encapsulation. Meanwhile, HTL‐free based on low‐temperature layer exhibit impressive performance robustness in bending test. More importantly, (5 5 pixels) imaging system fabricated uniform clear results under flatting state. This research is great significance for application stable high‐performance inorganic systems.

Язык: Английский

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Dual-Passivation Strategy with Escaped Thiocyanate and Sturdy Chloride toward Large-Scale Wide-Band-Gap Perovskite Modules

The Journal of Physical Chemistry C, Год журнала: 2024, Номер 128(14), С. 6080 - 6088

Опубликована: Март 27, 2024

Wide-band-gap (WBG) perovskite solar cells have gained significant attention in silicon/perovskite tandem due to their suitable band gap and high open circuit voltage (Voc). However, the phase separation film defects of WBG films severely hindered larger Voc efficiency. Herein, we demonstrate a simple passivation approach with potassium thiocyanate methylammonium chloride dual-passivation, which could effectively increase grain size suppress ion migration separation. Consequently, wide-band-gap (1.69 eV) dual-passivation exhibit relatively power conversion efficiency (PCE) 20.35% 1.20 V. Meanwhile, mini-module an area 12 cm2 obtains impressive PCE 17.4%. The optimized state-of-the-art favorable storage stability.

Язык: Английский

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