High-efficiency and thermal/moisture stable CsPbI2.84Br0.16inorganic perovskite solar cells enabled by a multifunctional cesium trimethylacetate organic additive

Zhao，Hang1,2; Fu，Yao1,2; Li，Zhenzhen1,2; Yang，Shujie1,2; Xu，Baomin3; Liu，Xiaolong1,2; Xu，Jia1,2; Liu，Shengzhong (Frank)4; Yao，Jianxi1,2

2021-02-28

10.1039/d0ta11858c

Journal of Materials Chemistry A   影响因子和分区

2050-7488

2050-7496

All-inorganic cesium lead iodine perovskite materials (CsPbI) have been widely studied and applied to PSCs because of their excellent thermo-chemical stability and suitable bandgap. However, CsPbIstill faces the issue of phase transitions under humid conditions. In this study, cesium trimethylacetate (CsTa) organic cesium salt is employed as an additive in the CsPbIBrfilm. The results show that CsTa can have multifunctional effects on CsPbIBrperovskite stability. The steric hindrance blocking effect of Taanions can efficiently prevent the tilt of the [PbI]octahedrons to inhibit the phase transition process from the corner-shared perovskite to the edge-shared non-perovskite structure. The Tagroups are firmly located at the X site of the perovskite structure, leading to an increase in the energy barrier for X-site vacancy generation (from 0.816 eV to 1.217 eV), which slows the phase transition process induced by lattice disorder. Meanwhile, the decrease in crystal grain size after adding CsTa is beneficial for perovskite phase stability due to the decreased surface Gibbs free energy of CsPbIBrcrystals. In addition, the reduced defect density brought about by the improved crystal quality is also favorable for increasing the energy barrier for the phase transition from the perovskite phase to the δ phase. Finally, a champion PCE of 16.59% can be achieved from the HPbI-prepared PSCs with adding CsTa, which maintain 80.88% of the initial performance after more than 1200 hours in air (RH: ∼20%). Meanwhile, both 0.1-CsTa and 0.2-CsTa PbI-prepared PSCs deliver excellent stability and maintain above 80% of the initial PCE after nearly 2000 hours. Impressively, under a relatively high thermal/moisture (temperature: 80 °C/RH: ∼80%) environment, the 0.2-CsTa devices can still retain 87.41% of the initial performance after 500 hours of storage.

SCI ; EI

英语

其他

National Key Research and Development Program of China[2016YFA0202400] ; National Natural Science Foundation of China[51772095,61705066] ; Hebei Province Key Research and Development Project[20314305D] ; Fundamental Research Funds for the Central Universities[2019JG003]

Chemistry ; Energy & Fuels ; Materials Science

Chemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary

WOS:000624755900036

ROYAL SOC CHEMISTRY

20211010035071

Additives ; Binary alloys ; Cesium compounds ; Chemical stability ; Crystals ; Energy barriers ; Free energy ; Gibbs free energy ; Layered semiconductors ; Organic solar cells ; Perovskite

Minerals:482.2 ; Thermodynamics:641.1 ; Chemistry:801 ; Chemical Agents and Basic Industrial Chemicals:803 ; Crystalline Solids:933.1

2-s2.0-85102006212

Scopus

1.State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing,102206,China
2.Beijing Key Laboratory of Energy Safety and Clean Utilization,North China Electric Power University,Beijing,102206,China
3.Department of Materials Science and Engineering,Shenzhen Engineering Research and Development Center for Flexible Solar Cells,Southern University of Science and Technology,Shenzhen,518055,China
4.Key Laboratory of Applied Surface and Colloid Chemistry,National Ministry of Education,Shaanxi Key Laboratory for Advanced Energy Devices,Shaanxi Engineering Lab for Advanced Energy Technology,Institute for Advanced Energy Materials,School of Materials Science and Engineering,Shaanxi Normal University,Xi'an,710119,China

Zhao，Hang,Fu，Yao,Li，Zhenzhen,et al. High-efficiency and thermal/moisture stable CsPbI2.84Br0.16inorganic perovskite solar cells enabled by a multifunctional cesium trimethylacetate organic additive[J]. Journal of Materials Chemistry A,2021,9(8):4922-4932.

Zhao，Hang.,Fu，Yao.,Li，Zhenzhen.,Yang，Shujie.,Xu，Baomin.,...&Yao，Jianxi.(2021).High-efficiency and thermal/moisture stable CsPbI2.84Br0.16inorganic perovskite solar cells enabled by a multifunctional cesium trimethylacetate organic additive.Journal of Materials Chemistry A,9(8),4922-4932.

Zhao，Hang,et al."High-efficiency and thermal/moisture stable CsPbI2.84Br0.16inorganic perovskite solar cells enabled by a multifunctional cesium trimethylacetate organic additive".Journal of Materials Chemistry A 9.8(2021):4922-4932.