Surface Defects Management by In Situ Etching with Methanol for Efficient Inverted Inorganic Perovskite Solar Cells DOI

Hongrui Sun,

Sanlong Wang,

Shanshan Qi

et al.

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(23)

Published: March 15, 2023

Abstract Inorganic perovskite solar cells (IPSCs) have developed rapidly due to their good thermal stability and the bandgap suitable for perovskite/silicon tandem cells. However, large open‐circuit voltage (V OC ) deficit derived from surface defects energy level structure mismatch impede development of device performance, especially in P‐I‐N IPSCs. Herein, an innovative situ etching (ISE) treatment method is proposed reduce through methanol without additional passivator. It found that films treated with result a slight excess PbI 2 on inserted into grain boundaries. Therefore, successful decrease by passivation boundary greatly trap density films. And larger work function contributes band bending downward forms gradient alignment at I/N interface, which accelerates extraction charge carriers. As result, efficiency CsPbI 2.85 Br 0.15 inverted IPSC enhanced 16.00% 19.34%, one mostly efficient This provides original idea passivator manage inorganic perovskite.

Language: Английский

Fluorine‐Containing Passivation Layer via Surface Chelation for Inorganic Perovskite Solar Cells DOI
Hao Zhang, Wanchun Xiang,

Xuejiao Zuo

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 62(6)

Published: Dec. 8, 2022

Minimizing surface defect is vital to further improve power conversion efficiency (PCE) and stability of inorganic perovskite solar cells (PSCs). Herein, we designed a passivator trifluoroacetamidine (TFA) suppress CsPbI3-x Brx film defects. The amidine group TFA can strongly chelate onto the iodide vacancy, strengthened by additional hydrogen bonds. Moreover, three fluorine atoms allow strong intermolecular connection via bonds, thus constructing robust shield against moisture. TFA-treated PSCs exhibit remarkably suppressed recombination, yielding record PCEs 21.35 % 17.21 for 0.09 cm2 1.0 device areas, both which are highest all-inorganic so far. also achieves PCE 39.78 under indoor illumination, photovoltaic devices. Furthermore, greatly improves ambient preserving 93 initial after 960 h.

Language: Английский

Citations

113
Highly efficient CsPbI3/Cs1-xDMAxPbI3 bulk heterojunction perovskite solar cell DOI Creative Commons

Xiuhong Sun,

Zhipeng Shao, Zhipeng Li

et al.

Joule, Journal Year: 2022, Volume and Issue: 6(4), P. 850 - 860

Published: March 3, 2022

Language: Английский

Citations

94
A Multifunctional “Halide‐Equivalent” Anion Enabling Efficient CsPb(Br/I)3 Nanocrystals Pure‐Red Light‐Emitting Diodes with External Quantum Efficiency Exceeding 23% DOI
Jibin Zhang, Tiankai Zhang, Zhuangzhuang Ma

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 35(8)

Published: Dec. 9, 2022

Pure-red perovskite LEDs (PeLEDs) based on CsPb(Br/I)3 nanocrystals (NCs) usually suffer from a compromise in emission efficiency and spectral stability account of the surface halide vacancies-induced nonradiative recombination loss, phase segregation, self-doping effect. Herein, "halide-equivalent" anion benzenesulfonate (BS- ) is introduced into NCs as multifunctional additive to simultaneously address above challenging issues. Joint experiment-theory characterizations reveal that BS- can not only passivate uncoordinated Pb2+ -related defects at NCs, but also increase formation energy vacancies. Moreover, because strong electron-withdrawing property sulfonate group, electrons are expected transfer NC for reducing effect altering n-type behavior near ambipolarity. Eventually, synergistic boost device performance achieved pure-red PeLEDs with CIE coordinates (0.70, 0.30) champion external quantum 23.5%, which one best value among ever-reported red approaching Rec. 2020 primary color. -modified PeLED exhibits negligible wavelength shift under different operating voltages. This strategy paves an efficient way improving PeLEDs.

Language: Английский

Citations

91
Tailored Cysteine‐Derived Molecular Structures toward Efficient and Stable Inorganic Perovskite Solar Cells DOI
Hao Zhang, Qingwen Tian, Wanchun Xiang

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(31)

Published: March 27, 2023

Abstract Surface–defect‐triggered non‐radiative charge recombination and poor stability have become the main roadblock to continued improvement in inorganic perovskite solar cells (PSCs). Herein, culprits are identified on surface by first‐principles calculations, purposefully design a brand‐new passivator, Boc‐S‐4‐methoxy‐benzyl‐l‐cysteine (BMBC), whose multiple Lewis‐based functional groups (NH, S CO) suppress halide vacancies coordinate with undercoordinated Pb 2+ through typical Lewis baseacid reactions. The tailored electron‐donating methoxyl group (CH 3 O–) can cause an increased electron density benzene ring, which strengthens interaction via electrostatic interactions. This BMBC passivation reduce trap density, enlarge grains, prolong lifetime, more suitable energy‐level alignment. In addition, hydrophobic tert‐butyl butoxycarbonyl (Boc‐) ensures that is uniformly covered prevents harmful aggregation steric repulsion at perovskite/hole–transporting layer (HTL) interface, thus providing umbrella resist moisture invasion. Consequently, combination of above increases efficiency CsPbI 3−x Br x PSC from 18.6% 21.8%, highest for this type metal PSCs so far, as far it known. Moreover, device exhibits higher environmental thermal stability.

Language: Английский

Citations

84
Interface Modification for Efficient and Stable Inverted Inorganic Perovskite Solar Cells DOI
Tianfei Xu, Wanchun Xiang,

Junjie Yang

et al.

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(31)

Published: June 7, 2023

Due to their excellent thermal stability and ideal bandgap, metal halide inorganic perovskite based solar cells (PSCs) with inverted structure are considered as an choice for perovskite/silicon tandem cells. However, the power conversion efficiency (PCE) of still lags far behind that conventional n-i-p PSCs due interfacial energy level mismatch high nonradiative charge recombination. Herein, performance is significantly improved by engineering CsPbI3-x Brx films 2-mercapto-1-methylimidazole (MMI). It found mercapto group can preferably react undercoordinated Pb2+ from forming Pb-S bonds, which appreciably reduces surface trap density. Moreover, MMI modification results in a better alignment electron-transporting material, promoting carrier transfer reducing voltage deficit. The above combination open-circuit enhancement 120 mV, yielding champion PCE 20.6% 0.09 cm2 area 17.3% 1 area. Furthermore, ambient, operational heat stabilities also greatly improved. work demonstrates simple but effective approach fabricating highly efficient stable PSCs.

Language: Английский

Citations

81
Stable 24.29%‐Efficiency FA0.85MA0.15PbI3 Perovskite Solar Cells Enabled by Methyl Haloacetate‐Lead Dimer Complex DOI

Sheng Zhan,

Yuwei Duan, Zhike Liu

et al.

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 12(27)

Published: June 13, 2022

Abstract Formamidinium methylammonium lead iodide (FAMAPbI 3 ) perovskite has been intensively investigated as a potential photovoltaic material because it higher phase stability than its pure FAPbI counterpart. However, power conversion efficiency (PCE) is significantly inferior due to high density of surface detects and mismatched energy level with electrodes. Herein, bifunctional passivator, methyl haloacetate (methyl chloroacetate, (MClA), bromoacetate (MBrA)), designed reduce defect density, tune the levels improve interfacial charge extraction in FAMAPbI cell by synergistic passivation both CO groups halogen anions. As predicted modeling undercoordinated Pb 2+ , MBrA shows very strong interaction forming dimer complex ([C 6 H 10 Br 2 O 4 Pb] ), which effectively reduces suppresses non‐radiative recombination. Meanwhile, − passivates iodine‐deficient defects. Consequently, MBrA‐modified device presents an excellent PCE 24.29%, open‐circuit voltage ( V oc 1.18 loss ≈ 0.38 V), one highest PCEs among all ‐based solar cells reported date. Furthermore, devices without any encapsulation exhibit remarkable long‐term only 9% after exposure ambient air for 1440 h.

Language: Английский

Citations

79
Multidentate Chelation Heals Structural Imperfections for Minimized Recombination Loss in Lead‐Free Perovskite Solar Cells DOI

Gengling Liu,

Yang Zhong,

Wenhuai Feng

et al.

Angewandte Chemie International Edition, Journal Year: 2022, Volume and Issue: 61(40)

Published: Aug. 19, 2022

Tin-based perovskite solar cells (Sn-PSCs) have emerged as promising environmentally viable photovoltaic technologies, but still suffer from severe non-radiative recombination loss due to the presence of abundant deep-level defects in film and under-optimized carrier dynamics throughout device. Herein, we healed structural imperfections Sn perovskites an "inside-out" manner by incorporating a new class biocompatible chelating agent with multidentate claws, namely, 2-Guanidinoacetic acid (GAA), which passivated variety Sn-related I-related defects, cooperatively reinforced passivation efficacy, released lattice strain, improved toughness, promoted transport perovskites. Encouragingly, efficiency 13.7 % small voltage deficit ≈0.47 V has been achieved for GAA-modified Sn-PSCs. GAA modification also extended lifespan Sn-PSCs over 1200 hours.

Language: Английский

Citations

76
Polishing the Lead‐Poor Surface for Efficient Inverted CsPbI3 Perovskite Solar Cells DOI
Sheng Fu, Jiabo Le,

Xueming Guo

et al.

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(38)

Published: Aug. 2, 2022

Triiodide cesium lead perovskite (CsPbI3 ) has promising prospects in the development of efficient and stable photovoltaics both single-junction tandem structures. However, achieving inverted devices that provide good stability are compatible to remains a challenge, deep insights still not understood. This study finds surface components CsPbI3 intrinsically lead-poor relevant traps p-type with localized states. These deep-energy-level p induce inferior transfer or electrons serious nonradiative recombination at /PCBM interface, leading considerable open-circuit voltage (Voc loss reduction fill factor (FF). Compared molecular passivation, polishing treatment 1,4-butanediamine can eliminate nonstoichiometric root these for superior electron transfer. The significantly improves FF Voc photovoltaics, creating an efficiency promotion from 12.64% 19.84%. Moreover, 95% initial optimized is maintained after output operation 1000 h.

Language: Английский

Citations

75
Inhibiting lattice distortion of CsPbI3 perovskite quantum dots for solar cells with efficiency over 16.6% DOI

Donglin Jia,

Jingxuan Chen,

Rongshan Zhuang

et al.

Energy & Environmental Science, Journal Year: 2022, Volume and Issue: 15(10), P. 4201 - 4212

Published: Jan. 1, 2022

A feasible ligand riveting strategy for perovskite quantum dots (PQDs) is reported to substantially inhibit the lattice distortion and simultaneously efficiently passivate surface of PQDs PQD solar cells with an efficiency over 16.6%.

Language: Английский

Citations

74
Structurally Dimensional Engineering in Perovskite Photovoltaics DOI
Yulin Liu, Songyang Yuan,

Huiqun Zheng

et al.

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(23)

Published: May 4, 2023

Abstract The low‐dimensional (LD) perovskites are proven to be capable of blocking moisture erosion and thereby improving the photovoltaic device stability. In this review, perovskite materials carefully summarized that induced by A‐position organic substituents, starting from crystal microstructure electronic structure LD (2D, 1D, 0D) with regulating dimensions, combined first principles calculation (DFT). By further studying thermodynamics dynamics crystallization nucleation growth LD–3D thin films in heterojunction region, solar cells controllable dimensions can situ prepared. Various devices systematically summarized, which shows flexible regulation energy band carrier transport characteristics, locks water oxygen corrosion channel close‐fitting conjugated structure, improves long‐term stability cells. This review is expected provide some guidance for development multipurpose use through depth understanding structurally dimensional engineering photovoltaics.

Language: Английский

Citations

54