Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/144101
Title: Efficient inverted perovskite solar cells by employing n-type (D-A1-D-A2) polymers as electron transporting layer
Authors: Ahmed Ali Said
Xie, Jian
Wang, Yang
Wang, Zongrui
Zhou, Yu
Zhao, Kexiang
Gao, Wei-Bo
Michinobu, Tsuyoshi
Zhang, Qichun
Keywords: Engineering::Materials
Issue Date: 2019
Source: Ahmed Ali Said, Xie, J., Wang, Y., Wang, Z., Zhou, Y., Zhao, K., ... Zhang, Q. (2019). Efficient inverted perovskite solar cells by employing n-type (D-A1-D-A2) polymers as electron transporting layer. Small, 15(29), e1803339-. doi:10.1002/smll.201803339
Project: AcRF Tier 1 RG 111/17
AcRF Tier 1 RG 2/17
AcRF Tier 1 RG 114/16
AcRF Tier 1RG 8/16
MOE 2017-T2-1-021
ASPIRE League Research Grant 2018, Tokyo Tech
Journal: Small
Abstract: It is highly desirable to employ n-type polymers as electron transporting layers (ETLs) in inverted perovskite solar cells (PSCs) due to their good electron mobility, high hydrophobicity, and simplicity of film forming. In this research, the capability of three n-type donor-acceptor1 -donor-acceptor2 (D-A1 -D-A2 ) conjugated polymers (pBTT, pBTTz, and pSNT) is first explored as ETLs because these polymers possess electron mobilities as high as 0.92, 0.46, and 4.87 cm2 (Vs)-1 in n-channel organic transistors, respectively. The main structural difference among pBTT, pBTTz, and pSNT is the position of sp2 -nitrogen atoms (sp2 -N) in the polymer main chains. Therefore, the effect of different substitution positions on the PSC performances is comprehensively studied. The as-fabricated p-i-n PSCs with pBTT, pBTTz, and pSNT as ETLs show the maximum photoconversion efficiencies of 12.8%, 14.4%, and 12.0%, respectively. To be highlighted, pBTTz-based device can maintain 80% of its stability after ten days due to its good hydrophobicity, which is further confirmed by a contact angle technique. More importantly, the pBTTz-based device shows a neglected hysteresis. This study reveals that the n-type polymers can be promising candidates as ETLs to approach solution-processed highly-efficient inverted PSCs.
URI: https://hdl.handle.net/10356/144101
ISSN: 1613-6829
DOI: 10.1002/smll.201803339
Rights: This is the accepted version of the following article: Ahmed Ali Said, Xie, J., Wang, Y., Wang, Z., Zhou, Y., Zhao, K., ... Zhang, Q. (2019). Efficient inverted perovskite solar cells by employing n-type (D-A1-D-A2) polymers as electron transporting layer. Small, 15(29), e1803339-. doi:10.1002/smll.201803339, which has been published in final form at 10.1002/smll.201803339. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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