Low‐Bandgap Methylammonium‐Rubidium Cation Sn‐Rich Perovskites for Efficient Ultraviolet–Visible–Near Infrared Photodetectors

Zhu, Lu; Liang, Zhifu; Huo, Zhengbao; Ng, Wai Kit; Mao, Jian; Wong, Kam Sing; Yin, Wan‐Jian; Choy, Wallace C. H.

doi:10.1002/adfm.201706068

Cited by 75 publications

(82 citation statements)

References 48 publications

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“…Furthermore, precursor engineering that either mixed individual Sn and Pb based precursors or blended with additives (such as chloride, Rb, and Cs) would be employed to tune the crystallization. These Sn‐Pb binary perovskite precursor films generally spin‐coated on poly(3,4‐ethylenedioxythiophene):poly(p‐styrene sulfonate) (PEDOT:PSS) substrates would be washed/immersed by anti‐solvents, including toluene, anisole or diethyl ether, and annealed . Meanwhile, Sn‐Pb binary perovskite films can be formed by two‐step solution‐process methods.…”

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

“…Precursor engineering: Rubidium . Choy and co‐workers introduced tiny Rb cations into Sn‐rich MASn 0.65 Pb 0.35 I 3 perovskite precursors in the DMSO:DMF co‐solvent . Conventionally, adding small‐size Rb into large‐size FA cation perovskites could tune tolerance factor, and stabilize the perovskite phase .…”

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

“…Very recently, Choy and co‐workers incorporated rubidium cations into the MA Sn‐Pb perovskite system to realize controllable crystallization, as discussed in Section 2.1.1 One‐step solution‐process methods . Compared with MASn 0.65 Pb 0.35 I 3 perovskites, MA 0.975 Rb 0.025 Sn 0.65 Pb 0.35 I 3 perovskite films exhibited improved crystallinity, strengthened preferred orientation, which resulted into a smaller potential difference at the grain boundaries/grain interiors interface and a longer carrier lifetime.…”

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

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Crystallization, Properties, and Challenges of Low‐Bandgap Sn–Pb Binary Perovskites

Zhu

Choy

2018

Solar RRL

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Solution‐process and low‐temperature perovskites have motivated a broad range of interests and intensive studies for applications in solar cells (SCs) and photodetectors (PDs). Perovskite SCs with the bandgap of ≈1.5 eV currently exhibit the certified efficiency over 22% comparable with those of established thin film technologies. Meanwhile, perovskite PDs achieve superb performances in the visible region compared with commercial Si PDs. Partial substitution of Sn into Pb‐based perovskites can tune the absorption to near‐infrared (NIR) region, which would achieve an ideal‐bandgap perovskite approaching the Shockley–Queisser‐efficiency limit, low‐bandgap perovskite‐based bottom subcells in tandem devices (≈1.2 eV), and NIR photodetection. Here, various crystallization methods for growing low‐bandgap Sn–Pb binary perovskites are presented. Their impacts on morphology, crystallinity, preferred orientation, carrier lifetimes, Urbach energy, and stability of the resultant Sn–Pb binary perovskites are highlighted. Then, a description is given of single‐junction, 2‐terminal, and 4‐terminal SCs using these perovskites as absorbers, which achieve up‐to‐date efficiencies of 17.8%, 18.4%, and 21.2%, respectively. The current development of ultraviolet–visible–NIR PDs using these perovskites is also discussed. Furthermore, the challenges in controlling inter‐grain Sn/Pb element distributions and perovskite stability, which will influence performance and stability of Sn–Pb perovskite‐based devices, are presented. Finally, potential prospects are discussed for advancing low‐bandgap Sn–Pb binary perovskite‐based optoelectronic devices.

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Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

Section: Crystallization Properties and Applications Of Low‐bandgapmentioning

confidence: 99%

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Crystallization, Properties, and Challenges of Low‐Bandgap Sn–Pb Binary Perovskites

Zhu

Choy

2018

Solar RRL

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Highly Efficient Sn/Pb Binary Perovskite Solar Cell via Precursor Engineering: A Two‐Step Fabrication Process

Lian

Chen

Zhang

et al. 2018

Adv Funct Materials

135

124

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Regulation of the crystallization of perovskite films and avoiding the oxidation of Sn2+ during the deposition process are very important for achieving Sn/Pb binary perovskite solar cells (PVSCs) with high power conversion efficiency (PCE) and producibility. In this work, a high‐quality HC(NH2)2Pb0.7Sn0.3I3 (FAPb0.7Sn0.3I3) film deposited from the two‐step solution process by introducing methylammonium thiocyanate (MASCN) as a bifunctional additive into the precursor solution containing PbI2 and SnI2 is reported. MASCN can not only tune the morphology of the perovskite film but also stabilize the precursor solution via retarding the oxidation of Sn2+ through a strong coordination between SCN− and Sn2+. The Sn/Pb binary inverted PVSCs based on FAPb0.7Sn0.3I3 present a high fill factor of 0.79 and the best PCE of 16.26% in the case of 0.25 MASCN addition. The device fabrication producibility is also greatly improved due to the stabilized precursor solution with the aid of MASCN. The PCE of the device is almost independent of the storage time of the precursor solution within 124 d in the N2‐filled glove box. These results indicate that the precursor engineering with multifunctionality additive is an effective approach toward highly efficient and producible PVSCs for future commercialization.

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Double‐Side Crystallization Tuning to Achieve over 1 µm Thick and Well‐Aligned Block‐Like Narrow‐Bandgap Perovskites for High‐Efficiency Near‐Infrared Photodetectors

Liu

Zhu

Wang

et al. 2021

Adv Funct Materials

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Solution‐processed narrow‐bandgap Sn–Pb perovskites have shown their potential in near‐infrared (NIR) photodetection as a promising alternative to traditional silicon and inorganic compounds. To achieve efficient NIR photodetection, high‐quality Sn–Pb perovskite thick films with well‐packed, smooth, and pinhole/void‐free features are highly desirable for boosting the spectral absorption. Understanding the crystallization kinetics and tuning the crystallization are fundamentally important to reach such high‐quality thick Sn–Pb perovskite films, and have been limitedly explored. Herein, an approach of double‐side crystallization tuning through low‐temperature space‐restricted annealing in methylammonium‐free Sn–Pb perovskite films with over 1 µm thickness is proposed. More specifically, through simultaneously retarding the crystallization in the top of precursor films and promoting the crystal growth of the bottom of precursor films, high‐quality and block‐like thick FA0.85Cs0.15Sn0.5Pb0.5I3 perovskite films with improved crystallinity, preferred out‐of‐plane orientation, and reduced trap density are achieved. Finally, photovoltaic‐mode Sn–Pb perovskite NIR photodetectors show a high external quantum efficiency of ≈80% at 760–900 nm, a recorded responsivity of 0.53 A W−1, and a high specific detectivity of 6 × 1012 Jones at 940 nm. This study offers the fundamental understanding of the crystallization kinetics of thick perovskite films and paves the way for perovskite‐based emerging NIR photodetection and imaging applications.

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Low‐Bandgap Methylammonium‐Rubidium Cation Sn‐Rich Perovskites for Efficient Ultraviolet–Visible–Near Infrared Photodetectors

Cited by 75 publications

References 48 publications

Crystallization, Properties, and Challenges of Low‐Bandgap Sn–Pb Binary Perovskites

Crystallization, Properties, and Challenges of Low‐Bandgap Sn–Pb Binary Perovskites

Highly Efficient Sn/Pb Binary Perovskite Solar Cell via Precursor Engineering: A Two‐Step Fabrication Process

Double‐Side Crystallization Tuning to Achieve over 1 µm Thick and Well‐Aligned Block‐Like Narrow‐Bandgap Perovskites for High‐Efficiency Near‐Infrared Photodetectors

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