Abstract
All-inorganic and lead-free cesium tin halides (CsSnX3, X=Cl, Br, I) are highly desirable for substituting the organolead halide perovskite solar cells. However, the poor stability of CsSnX3 perovskites has so far prevented the fabrication of devices that can withstand sustained operation under normal conditions. In this paper, a two-step sequential deposition method is developed to grow high-quality B-γ-CsSnI3 thin films and their unique phase change in atmosphere is explored in detail. We find the spontaneous oxidative conversion from unstable B-γ-CsSnI3 to air-stable Cs2SnI6 in air. Allowing the phase conversion of the CsSnI3 film to evolve in ambient air it gives the semiconducting perovskite Cs2SnI6 with a bandgap of 1.48 eV and high absorption coefficient (over 105 cm−1 from 1.7 eV). More importantly, the Cs2SnI6 film, for the first time, is adopted as a light absorber layer for a lead-free perovskite solar cell and a preliminary estimate of the power conversion efficiency (PCE) about 1% with open-circuit voltage of 0.51 V and short-circuit current of 5.41 mA/cm2 is realized by optimizing the perovskite absorber thickness. According to the bandgap and the Shockley-Queisser limit, such inorganic perovskite solar cell with higher efficiency and pronounced stability can be expected by material quality improvement and device engineering.
| Original language | English |
|---|---|
| Pages (from-to) | 227-234 |
| Number of pages | 8 |
| Journal | Solar Energy Materials and Solar Cells |
| Volume | 159 |
| DOIs | |
| Publication status | Published - Jan 1 2017 |
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Keywords
- Air-stable
- CsSnI
- Lead-free
- Perovskite absorber
- Solar cell
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
Cite this
From unstable CsSnI3 to air-stable Cs2SnI6 : A lead-free perovskite solar cell light absorber with bandgap of 1.48 eV and high absorption coefficient. / Qiu, Xiaofeng; Cao, Bingqiang; Yuan, Shuai; Chen, Xiangfeng; Qiu, Zhiwen; Jiang, Yanan; Ye, Qian; Wang, Hongqiang; Zeng, Haibo; Liu, Jian; Kanatzidis, Mercouri G.
In: Solar Energy Materials and Solar Cells, Vol. 159, 01.01.2017, p. 227-234.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - From unstable CsSnI3 to air-stable Cs2SnI6
T2 - A lead-free perovskite solar cell light absorber with bandgap of 1.48 eV and high absorption coefficient
AU - Qiu, Xiaofeng
AU - Cao, Bingqiang
AU - Yuan, Shuai
AU - Chen, Xiangfeng
AU - Qiu, Zhiwen
AU - Jiang, Yanan
AU - Ye, Qian
AU - Wang, Hongqiang
AU - Zeng, Haibo
AU - Liu, Jian
AU - Kanatzidis, Mercouri G
PY - 2017/1/1
Y1 - 2017/1/1
N2 - All-inorganic and lead-free cesium tin halides (CsSnX3, X=Cl, Br, I) are highly desirable for substituting the organolead halide perovskite solar cells. However, the poor stability of CsSnX3 perovskites has so far prevented the fabrication of devices that can withstand sustained operation under normal conditions. In this paper, a two-step sequential deposition method is developed to grow high-quality B-γ-CsSnI3 thin films and their unique phase change in atmosphere is explored in detail. We find the spontaneous oxidative conversion from unstable B-γ-CsSnI3 to air-stable Cs2SnI6 in air. Allowing the phase conversion of the CsSnI3 film to evolve in ambient air it gives the semiconducting perovskite Cs2SnI6 with a bandgap of 1.48 eV and high absorption coefficient (over 105 cm−1 from 1.7 eV). More importantly, the Cs2SnI6 film, for the first time, is adopted as a light absorber layer for a lead-free perovskite solar cell and a preliminary estimate of the power conversion efficiency (PCE) about 1% with open-circuit voltage of 0.51 V and short-circuit current of 5.41 mA/cm2 is realized by optimizing the perovskite absorber thickness. According to the bandgap and the Shockley-Queisser limit, such inorganic perovskite solar cell with higher efficiency and pronounced stability can be expected by material quality improvement and device engineering.
AB - All-inorganic and lead-free cesium tin halides (CsSnX3, X=Cl, Br, I) are highly desirable for substituting the organolead halide perovskite solar cells. However, the poor stability of CsSnX3 perovskites has so far prevented the fabrication of devices that can withstand sustained operation under normal conditions. In this paper, a two-step sequential deposition method is developed to grow high-quality B-γ-CsSnI3 thin films and their unique phase change in atmosphere is explored in detail. We find the spontaneous oxidative conversion from unstable B-γ-CsSnI3 to air-stable Cs2SnI6 in air. Allowing the phase conversion of the CsSnI3 film to evolve in ambient air it gives the semiconducting perovskite Cs2SnI6 with a bandgap of 1.48 eV and high absorption coefficient (over 105 cm−1 from 1.7 eV). More importantly, the Cs2SnI6 film, for the first time, is adopted as a light absorber layer for a lead-free perovskite solar cell and a preliminary estimate of the power conversion efficiency (PCE) about 1% with open-circuit voltage of 0.51 V and short-circuit current of 5.41 mA/cm2 is realized by optimizing the perovskite absorber thickness. According to the bandgap and the Shockley-Queisser limit, such inorganic perovskite solar cell with higher efficiency and pronounced stability can be expected by material quality improvement and device engineering.
KW - Air-stable
KW - CsSnI
KW - Lead-free
KW - Perovskite absorber
KW - Solar cell
UR - http://www.scopus.com/inward/record.url?scp=84988464604&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84988464604&partnerID=8YFLogxK
U2 - 10.1016/j.solmat.2016.09.022
DO - 10.1016/j.solmat.2016.09.022
M3 - Article
VL - 159
SP - 227
EP - 234
JO - Solar Energy Materials and Solar Cells
JF - Solar Energy Materials and Solar Cells
SN - 0927-0248
ER -