Enhanced Crystallinity of Triple-Cation Perovskite Film via Doping NH4SCN

Liu, Ziji; Liu, Detao; Chen, Hao; Ji, Long; Zheng, Hualin; Gu, Yiding; Feng, Wenlin; Chen, Zhi; Li, Shibin

doi:10.1186/s11671-019-3134-4

Cited by 20 publications

(17 citation statements)

References 34 publications

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“…The tiny peaks at 12.62° belong to PbI 2 crystal grains. [ 17 ] Although there is no noticeable peak shift, PHAI doped MAPbI 3 film shows narrower width of (110) diffraction peak as can be seen in Figure 2f. This narrower width indicates lower full width at half maximum (FWHM) of the XRD peak which supports improved crystallinity and higher average grain size.…”

Section: Resultsmentioning

confidence: 87%

Phenylhydrazinium Iodide for Surface Passivation and Defects Suppression in Perovskite Solar Cells

Laskar

Luo

Ghimire

et al. 2020

Adv Funct Materials

116

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In recent years, hybrid perovskite solar cells (HPSCs) have received considerable research attention due to their impressive photovoltaic performance and low-temperature solution processing capability. However, there remain challenges related to defect passivation and enhancing the charge carrier dynamics of the perovskites, to further increase the power conversion efficiency of HPSCs. In this work, the use of a novel material, phenylhydrazinium iodide (PHAI), as an additive in MAPbI 3 perovskite for defect minimization and enhancement of the charge carrier dynamics of inverted HPSCs is reported. Incorporation of the PHAI in perovskite precursor solution facilitates controlled crystallization, higher carrier lifetime, as well as less recombination. In addition, PHAI additive treated HPSCs exhibit lower density of filled trap states (10 10 cm −2 ) in perovskite grain boundaries, higher charge carrier mobility (≈11 × 10 −4 cm 2 V −1 s), and enhanced power conversion efficiency (≈18%) that corresponds to a ≈20% improvement in comparison to the pristine devices.

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Section: Resultsmentioning

confidence: 87%

Phenylhydrazinium Iodide for Surface Passivation and Defects Suppression in Perovskite Solar Cells

Laskar

Luo

Ghimire

et al. 2020

Adv Funct Materials

116

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“…Larger crystallites should lead to a reduced amount of grain boundaries. [60] The light to dark current ratio (I light /I dark ) was estimated for each electrode distance, with (BTBT) 2 CsPb 2 I 7 reaching the highest value of almost 2000 at a voltage bias of 15 V (Figure S11, Supporting Information). However, as the I light /I dark ratio depends on the amount of light absorbed by the device, a better detector performance metric is given by the specific detectivity D*.…”

Section: Optoelectronic Device Propertiesmentioning

confidence: 99%

Quasi‐2D Hybrid Perovskite Formation Using Benzothieno[3,2‐b]Benzothiophene (BTBT) Ammonium Cations: Substantial Cesium Lead(II) Iodide Black Phase Stabilization

Denis

Mertens

Gompel

et al. 2022

Advanced Optical Materials

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Abstract3D hybrid perovskites (APbX3) have made a significant impact on the field of optoelectronic materials due to their excellent performance combined with facile solution deposition and up‐scalable device fabrication. Nonetheless, these materials suffer from environmental instability. To increase material stability, the organic cation (A) is substituted by the non‐volatile cesium cation. However, the desired photoactive cesium lead(II) iodide black phase is metastable in ambient conditions and spontaneously converts into the photo‐inactive yellow δ‐phase. In this work, the black phase is stabilized by the formation of a quasi‐2D perovskite containing a benzothieno[3,2‐b]benzothiophene (BTBT) large organic ammonium cation. Thermal analysis shows that degradation of the butylammonium (BA)‐based quasi‐2D perovskite (BA)2CsPb2I7 sets in at ≈130 °C, while (BTBT)2CsPb2I7 is phase‐stable until ≈230 °C. Additionally, the (BTBT)2CsPb2I7 film does not show any sign of degradation after exposure to 77% Relative Humidity in the dark for 152 days, while (BA)2CsPb2I7 degrades in a single day. Photoconductor‐type detectors based on (BTBT)2CsPb2I7 demonstrate an increased external quantum efficiency and a similar specific detectivity compared to the BA‐based reference detectors. The results demonstrate the utility of employing a BTBT cation within the organic layer of quasi‐2D perovskites to significantly enhance the stability while maintaining the optoelectronic performance.

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“…The top-view SEM images of BA 2 MA 3 Pb 4 I 13 film with various amounts of H 2 O additive are shown in Fig. 3ac, and the corresponding cross-section SEM images are [45,46]. Therefore, the perovskite-3% H 2 O films with larger vertically oriented crystal grains contribute to efficient PVSCs.…”

Section: Resultsmentioning

confidence: 98%

“…4v). The N t was determined by the trap-filled limit voltage (V TFL ) according to equation (1) [14,46,49]:…”

Section: Resultsmentioning

confidence: 99%

Controllable Two-dimensional Perovskite Crystallization via Water Additive for High-performance Solar Cells

et al. 2020

Self Cite

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Steering the crystallization of two-dimensional (2D) perovskite film is an important strategy to improve the power conversion efficiency (PCE) of 2D perovskite solar cells (PVSCs). In this paper, the deionized water (H 2 O) additive is introduced into the perovskite precursor solution to prepare high-quality 2D perovskite films. The 2D perovskite film treated with 3% H 2 O shows a good surface morphology, increased crystal size, enhanced crystallinity, preferred orientation, and low defect density. The fabricated 2D PVSC with 3% H 2 O exhibits a higher PCE compared with that without H 2 O (12.15% vs 2.29%). Furthermore, the shelf stability of unsealed devices with 3% H 2 O under ambient environment is significantly improved. This work provides a simple method to prepare high-quality 2D perovskite films for efficient and stable 2D PVSCs.

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Enhanced Crystallinity of Triple-Cation Perovskite Film via Doping NH4SCN

Cited by 20 publications

References 34 publications

Phenylhydrazinium Iodide for Surface Passivation and Defects Suppression in Perovskite Solar Cells

Phenylhydrazinium Iodide for Surface Passivation and Defects Suppression in Perovskite Solar Cells

Quasi‐2D Hybrid Perovskite Formation Using Benzothieno[3,2‐b]Benzothiophene (BTBT) Ammonium Cations: Substantial Cesium Lead(II) Iodide Black Phase Stabilization

Controllable Two-dimensional Perovskite Crystallization via Water Additive for High-performance Solar Cells

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