Employing Lead Thiocyanate Additive to Reduce the Hysteresis and Boost the Fill Factor of Planar Perovskite Solar Cells

Ke, Weijun; Xiao, Chuanxiao; Wang, Changlei; Saparov, Bayrammurad; Duan, Hsin‐Sheng; Zhao, Dewei; Xiao, Zewen; Schulz, Philip; Harvey, Steven P.; Liao, Wei‐Qiang; Meng, Weiwei; Yu, Yue; Cimaroli, Alexander J.; Jiang, Chun‐Sheng; Zhu, Kai; Al‐Jassim, Mowafak; Fang, Guojia; Mitzi, David B.; Yan, Yanfa

doi:10.1002/adma.201600594

Cited by 510 publications

(412 citation statements)

References 67 publications

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“…The result is similar to the previous reports for MAPbI3 system, which suggested that most of the SCNwould evaporate during annealing and three dimension MAPbI3-x(SCN)x would be obtained. 29,30 Some other reports proposed that layered MA2Pb(SCN)2I2 would be formed rather than three dimension MAPbI3-x(SCN)x, whose XRD patterns are quite different from ours. 31,32 To make sure whether NH4SCN acts as a volatile additive, we tested the Fourier transform infrared spectra of perovskite materials with and without NH4SCN (Fig.…”

Section: Introductioncontrasting

confidence: 78%

Thiocyanate assisted performance enhancement of formamidinium based planar perovskite solar cells through a single one-step solution process

et al. 2016

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Thiocyanate ammonium (NH4SCN) is introduced into the fabrication of formamidinium lead triiodide (FAPbI3) film through one-step spin-coating. The promoted formation of the black trigonal phase α-FAPbI3 with better crystallinity have been observed after the addition of NH4SCN, together with the supression of the formation of the yellow hexagonal phase δ-FAPbI3. The planar perovskite solar cells (PVSCs) based on NH4SCN assisted formed α-FAPbI3 film with high quality present a highest power conversion efficiency of 11.44% when 30 mol% NH4SCN is applied. Notably, the addition of NH4SCN is found to enhance the moisture stability of the perovskite. As a result, the planar PVSCs with 30 mol% NH4SCN additive show improved stability under ambient (RH: 30% ~ 40%) over those based on pristine FAPbI3. NH4SCN simultaneously enhances the efficiency and moisture stability of FAPbI3 base PVSCs through single one-step solution method, facilitating its commercial fabrication and application. Fig. 3 (a) The planar PVSC device structure. (b) The energy level diagram of the perovskite solar cells. (c) J-V curves of perovskite solar cells with FAPbI3 with different content of SCN as the active layer. (d) Statistical distribution of power conversion efficiency (PCE) of the PVSCs based on FAPbI3 and 3S-FAPbI3. Cross sectional SEM images of (e) FAPbI3 and (f) 3S-FAPbI3 on FTO/compact TiO2 substrates.Thiocyanate ammonium additive is found to improve the performance of FAPbI 3 based planar perovskite solar cells through single one-step method.

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Section: Introductioncontrasting

confidence: 78%

Thiocyanate assisted performance enhancement of formamidinium based planar perovskite solar cells through a single one-step solution process

et al. 2016

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“…3C and D show the cut-off binding energy (E cut-off ) and Fermi edge (E F,edge ), respectively, of Lidoped P3HT. 41,42 It is known that the larger grains of the perovskite suppressed the charge traps at the grain boundaries, thereby, the R s was lowered and the hysteresis was mitigated. 40 Fig .…”

Section: Resultsmentioning

confidence: 99%

High-performance flexible and air-stable perovskite solar cells with a large active area based on poly(3-hexylthiophene) nanofibrils

Park

Han

et al. 2016

J. Mater. Chem. A

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Flexible metal halide perovskite solar cells (PSCs) have been considered promising wearable energy power sources. Recently, various multi-functional charge-transporting layers, with high conductivity and air stability, have been rapidly developed in order to improve device performance. The practical use of flexible PSCs requires the retention of the performance and air stability at large active areas. However, increasing the size of the active layer results in increased contact and series resistance at the interfaces of the device. This hinders the charge transport, leading to charge recombination and degradation of the device performance. Furthermore, the poor stability of organic small molecules is detrimental to longterm stability. As such, flexible PSCs based on Li-doped poly(3-hexylthiopehene) (P3HT) nanofibrils (LN-P3HT), as a hole transporting layer (HTL), are prepared by subjecting a P3HT solution to a cooling process. The nanofibrils obtained via the p-conjugation of the thiophene rings result in improved conductivity and air stability, yielding high-performance, flexible, and air-stable PSCs with an active area of 1 cm 2 (PCE ¼ 13.12%). This outstanding performance and mechanical stability are retained (PCE ¼ 12.96%) after 500 bending cycles at r ¼ 15 mm; these PSCs also exhibit a 30-day PCE retention of 87% (relative to the initial PCE) at a relative humidity of 30%. Therefore, this novel and facile strategy for preparing an efficient and air-stable organic HTL is a promising method for the realization of highperformance large-area flexible PSCs.

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“…[20][21][22] Oxo-functionalized graphene (oxoG) and its reduced analogue are a novel 2D network structure materials with excellent electrical conductivity, desirable semiconducting properties, and superior chemical stability, which has been successfully utilized in the field of the solar cell, and memory devices. In this regard, ion migration inhibition can be achieved by passivating the grain boundary, regulating the crystal growth process or using additives to inhibit the movement of ions themselves.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin Nanosheets of Oxo‐functionalized Graphene Inhibit the Ion Migration in Perovskite Solar Cells

Zuo

Qiong

et al. 2019

Advanced Energy Materials

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Recent progress of PSCs in efficiency and stability enhancement is addressed to the change of perovskite composition and crystal optimization. By introducing mixed cations and halide to adjust the composition of the organicinorganic hybrid perovskite, the crystal structure of the perovskite can be effectively improved, which ultimately led to the increased stability and efficiency of the PSCs. Compared with the single cation/ halide perovskite (methylammonium halide, formamidinium lead halide, and cesium lead halide), the mixed perovskite not only has higher PCE but also has better heat and humid air stability. [9][10][11][12] For mixed cation/halide perovskites, despite good optoelectronic properties, the mixing of multiple cations and halogens is prone to localized ionic enrichment during preparation, annealing, and operation. At the same time, as the cation and halide ions move in the builtin electric field of the device, local positive and negative ion vacancies are formed. These defects will cause significant hysteresis in the device and ultimately affect the performance of the device. [13][14][15][16][17] A series of studies on both experimental and theoretical methods [13,18,19] have been reported. Constraining Mixed cation/halide perovskites have led to a significant increase in the efficiency and stability of perovskite solar cells. However, mobile ionic defects inevitably exacerbate the photoinduced phase segregation and selfdecomposition of the crystal structure. Herein, ultrathin 2D nanosheets of oxo-functionalized graphene/dodecylamine (oxo-G/DA) are used to solve ion migration in cesium (Cs)-formamidinium (FA)-methylammonium (MA) triple-cation-based perovskites. Based on the superconducting carbon skeleton and functional groups that provide lone pairs of electrons on it, the ultrathin 2D network structure can fit tightly on the crystals and wrap them, isolating them, and thus reducing the migration of ions within the built-in electric field of the perovskite film. As evidence of the formation of sharp crystals with different orientation within the perovskite film, moiré fringes are observed in transmission electron microscopy. Thus, a champion device with a power conversion efficiency (PCE) of 21.1% (the efficiency distribution is 18.8 ± 1.7%) and a remarkable fill factor of 81%, with reduced hysteresis and improved long-term stability, is reported. This work provides a simple method for the improvement of the structural stability of perovskite in solar cells.

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Employing Lead Thiocyanate Additive to Reduce the Hysteresis and Boost the Fill Factor of Planar Perovskite Solar Cells

Cited by 510 publications

References 67 publications

Thiocyanate assisted performance enhancement of formamidinium based planar perovskite solar cells through a single one-step solution process

Thiocyanate assisted performance enhancement of formamidinium based planar perovskite solar cells through a single one-step solution process

High-performance flexible and air-stable perovskite solar cells with a large active area based on poly(3-hexylthiophene) nanofibrils

Ultrathin Nanosheets of Oxo‐functionalized Graphene Inhibit the Ion Migration in Perovskite Solar Cells

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