Highly Efficient and Stable Sn-Rich Perovskite Solar Cells by Introducing Bromine
- Authors
- Lee, Seojun; Kang, Dong-Won
- Issue Date
- Jul-2017
- Publisher
- AMER CHEMICAL SOC
- Keywords
- perovskite; lead reduction; Pb reduction; Sn-rich; bromine; solar cell
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.9, no.27, pp 22432 - 22439
- Pages
- 8
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 9
- Number
- 27
- Start Page
- 22432
- End Page
- 22439
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/74913
- DOI
- 10.1021/acsami.7b04011
- ISSN
- 1944-8244
1944-8252
- Abstract
- Compositional engineering of recently arising methylammonium (MA) lead (Pb) halide based perovskites is an essential approach for finding better perovskite compositions to resolve still remaining issues of toxic Pb, long-term instability, etc. In this work, we carried out crystallographic, morphological, optical, and photovoltaic characterization of compositional MASn(0.6)Pb(0.4)I(3-x)Br(x) by gradually introducing bromine (Br) into parental Pb-Sn binary perovskite (MASn(0.6)Pb(0.4)I(3)) to elucidate its function in Sn-rich (Sn:Pb = 6:4) perovskites. We found significant advances in crystallinity and dense coverage of the perovskite films by inserting the Br into Sn-rich perovskite lattice. Furthermore, light-intensity dependent open circuit voltage (V-oc,) measurement revealed much suppressed trap-assisted recombination for a proper Br-added (x = 0.4) device. These contributed to attaining the unprecedented power conversion efficiency of 12.1% and V-oc of 0.78 V, which are, to the best of our knowledge, the highest performance in the Sn-rich (>= 60%) perovskite solar cells reported so far. In addition, impressive enhancement of photocurrent-output stability and little hysteresis were found, which paves the way for the development of environmentally benign (Pb reduction), stable monolithic tandem cells using the developed low band gap (1.24-1.26 eV) MASn(0.6)Pb(0.4)I(3-x)Br(x) with suggested composition (x = 0.2-0.4).
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