Impact of Buried Interface Texture on Compositional Stratification and Ion Migration in Perovskite Solar Cells

Advanced Functional Materials, Год журнала: 2024, Номер unknown

Опубликована: Июнь 5, 2024

Abstract Despite the striking increase in power conversion efficiency (PCE) of lead‐based perovskite solar cells (PSCs), their poor operational stability impedes commercialization. Among various factors that influence device stability, ion migration has been identified as a key driver degradation. In this work, focus is on studying migration‐induced degradation inverted architecture PSCs, which employ either thin polymer layer or self‐assembled monolayer (SAM) for hole extraction. It demonstrated difference texture imposed by use these transport layers (HTL) an important and thus far inconspicuous factor impacts migration, consequently stability. By investigating buried interface detail, it revealed its strong impact vertical compositional stratification active layer. monitoring bias‐induced devices with different extraction layers, smooth polymer‐based HTL results higher degree than rough SAM HTL, corresponding to stronger former. These further indicate SAMs promising strategy suppress improve efficiency.

Язык: Английский

---

Multidimensional Deep Ultraviolet (DUV) Synapses Based on Organic/Perovskite Semiconductor Heterojunction Transistors for Antispoofing Facial Recognition Systems

Nano Letters, Год журнала: 2024, Номер 24(22), С. 6673 - 6682

Опубликована: Май 23, 2024

Reliably discerning real human faces from fake ones, known as antispoofing, is crucial for facial recognition systems. While neuromorphic systems offer integrated sensing-memory-processing functions, they still struggle with efficient antispoofing techniques. Here we introduce a system incorporating multidimensional deep ultraviolet (DUV) optoelectronic synapses to address these challenges. To overcome the complexity and high cost of producing DUV using traditional wide-bandgap semiconductors, developed low-temperature (≤70 °C) solution process fabricating based on PEA2PbBr4/C8-BTBT heterojunction field-effect transistors. This method enables large-scale (4-in.), uniform, transparent production synapses. These devices respond both visible light, showing features. Leveraging unique ability synapse (MDUVS) discriminate skin artificial materials, have achieved robust capability, successfully identifying genuine an accuracy exceeding 92%.

Язык: Английский

---

Anti‐Solvent‐Free Preparation for Efficient and Photostable Pure‐Iodide Wide‐Bandgap Perovskite Solar Cells

Angewandte Chemie International Edition, Год журнала: 2024, Номер 63(17)

Опубликована: Март 4, 2024

Abstract The perovskite/silicon tandem solar cell (TSC) has attracted tremendous attention due to its potential breakthrough the theoretical efficiency set for single‐junction cells. However, perovskite (PSC) designed as top component suffers from severe photo‐induced halide segregation owing mixed‐halide strategy achieving desirable wide‐bandgap (1.68 eV). Developing pure‐iodide perovskites is a promising route fabricate photostable TSCs. Here, we report efficient and PSCs made an anti‐solvent‐free (ASF) technique. ASF process achieved by mixing two precursor solutions, both of which are capable depositing corresponding films without involving anti‐solvent. mixed solution finally forms Cs 0.3 DMA 0.2 MA 0.5 PbI 3 film with bandgap 1.68 eV. Furthermore, methylammonium chloride additive applied enhance crystallinity reduce trap density films. As result, PSC delivers high 21.30 % excellent photostability, highest this type method significantly improves device reproducibility compared devices other anti‐solvent methods. Our findings provide novel recipe prepare PSCs.

Язык: Английский

---

π–π Stacking at the Perovskite/C₆₀ Interface Enables High‐Efficiency Wide‐Bandgap Perovskite Solar Cells

Small, Год журнала: 2024, Номер 20(35)

Опубликована: Апрель 26, 2024

Abstract Interface passivation is a key method for improving the efficiency of perovskite solar cells, and 2D/3D heterojunction mainstream strategy. However, layer also produces new interface between 2D fullerene (C 60 ), properties this have received little attention before. Here, underlying perovskite/C by taking TEA 2 PbX 4 (TEA = C 6 H 10 NS; X I, Br, Cl) passivator as an example are systematically expounded. It found that preferentially exhibits (002) orientation with outermost surface featuring oriented arrangement TEACl, where thiophene groups face outward. The outward further form strong π–π stacking system molecule, strengthening interaction force facilitating creation superior interface. Based on vacuum‐assisted blade coating, wide‐bandgap (WBG, 1.77 eV) cells achieved impressive records 19.28% (0.09 cm ) 18.08% (1.0 inefficiency, respectively. This research not only provides understanding processing future but lays solid foundation realizing efficient large‐area devices.

Язык: Английский

---

High-Efficiency Semitransparent Perovskite Solar Cells Enabled by Controlling the Crystallization of Ultrathin Films

ACS Energy Letters, Год журнала: 2024, Номер 9(6), С. 2936 - 2943

Опубликована: Май 26, 2024

Semitransparent perovskite solar cells (ST-PSCs) have emerged as an exciting prospect due to their applications in future smart buildings. Semitransparency is typically realized through the use of wide bandgap materials with a reduced thickness. In this study, we demonstrate methylammonium (MA)-free for active layer ST-PSCs. However, achieving defect-free highly crystalline films lower film thickness has been challenging. We report precursor engineering approach based on organic ammonium salt tryptamine hydro bromide (TABr) anion and cation group passivate both halide metal ion vacancies. TABr molecules regulate crystallization kinetics offer thinner films. The champion device exhibits power conversion efficiency (PCE) 14.21%, along average visible transparency (AVT) ∼22%. This work provides efficient method enhance performance ST-PSCs high AVT application building integrated photovoltaics (BIPVs).

Язык: Английский

---