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Iodomethane-Mediated Organometal Halide Perovskite with Record Photoluminescence Lifetime
Xu, WD; McLeod, JA; Yang, YG; Wang, YM; Wu, ZW; Bai, S; Yuan, ZC; Song, T; Wang, YS; Si, JJ; Wang, RB; Gao, XY; Zhang, XP; Liu, LJ; Sun, BQ; Sun, BQ (reprint author), Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Mat, Suzhou 215123, Jiangsu, Peoples R China.
2016
Source PublicationACS APPLIED MATERIALS & INTERFACES
ISSN1944-8244
Volume8Issue:35Pages:23181-23189
Subtype期刊论文
AbstractOrganometallic lead halide perovskites are excellent light harvesters for high-efficiency photovoltaic devices. However, as the key component in these devices, a perovskite thin film with good morphology and minimal trap states is still difficult to obtain. Herein we show that by incorporating a low boiling point alkyl halide such as iodomethane (CH3I) into the precursor solution, a perovskite (CH3NH3PbI3-xClx) film with improved grain size and orientation can be easily achieved. More importantly, these films exhibit a significantly reduced amount of trap states. Record photoluminescence lifetimes of more than 4 mu s are achieved; these lifetimes are significantly longer than that of pristine CH3NH3PbI3-xClx films. Planar heterojunction solar cells incorporating these CH3I-mediated perovskites have demonstrated a dramatically increased power conversion efficiency compared to the ones using pristine CH3NH3PbI3-xClx. Photoluminescence, transient absorption, and microwave detected photoconductivity measurements all provide consistent evidence that CH3I addition increases the number of excitons generated and their diffusion length, both of which assist efficient carrier transport in the photovoltaic device. The simple incorporation of alkyl halide to enhance perovskite surface passivation introduces an important direction for future progress on high efficiency perovskite optoelectronic devices.
KeywordIodomethane Perovskite Solar Cell Photoluminescence Lifetime Surface Passivation Trap State Transient Absorption Microwave Detected Photoconductivity
DOI10.1021/acsami.6b05770
Indexed BySCI
Language英语
WOS IDWOS:000382902800051
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/26550
Collection中科院上海应用物理研究所2011-2018年
Corresponding AuthorMcLeod, JA; Liu, LJ; Sun, BQ (reprint author), Soochow Univ, Inst Funct Nano & Soft Mat FUNSOM, Jiangsu Key Lab Carbon Based Mat, Suzhou 215123, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Xu, WD,McLeod, JA,Yang, YG,et al. Iodomethane-Mediated Organometal Halide Perovskite with Record Photoluminescence Lifetime[J]. ACS APPLIED MATERIALS & INTERFACES,2016,8(35):23181-23189.
APA Xu, WD.,McLeod, JA.,Yang, YG.,Wang, YM.,Wu, ZW.,...&Sun, BQ .(2016).Iodomethane-Mediated Organometal Halide Perovskite with Record Photoluminescence Lifetime.ACS APPLIED MATERIALS & INTERFACES,8(35),23181-23189.
MLA Xu, WD,et al."Iodomethane-Mediated Organometal Halide Perovskite with Record Photoluminescence Lifetime".ACS APPLIED MATERIALS & INTERFACES 8.35(2016):23181-23189.
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