Low-Bandgap Organic Bulk-Heterojunction Enabled Efficient and Flexible Perovskite Solar Cells

Shengfan WU; Zhen LI; Jie ZHANG; Xin WU; Xiang DENG; Yiming LIU; Jingkun ZHOU; Chunyi ZHI; Xinge YU; Wallace C.H. CHOY; Zonglong ZHU; Alex K.Y. JEN

doi:10.1002/adma.202105539

Low-Bandgap Organic Bulk-Heterojunction Enabled Efficient and Flexible Perovskite Solar Cells

Shengfan WU, Zhen LI, Jie ZHANG, Xin WU, Xiang DENG, Yiming LIU, Jingkun ZHOU, Chunyi ZHI, Xinge YU, Wallace C.H. CHOY, Zonglong ZHU^*, Alex K.Y. JEN^*

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

108 Citations (Scopus)

Abstract

Lead halide perovskite and organic solar cells (PSCs and OSCs) are considered as the prime candidates currently for clean energy applications due to their solution and low-temperature processibility. Nevertheless, the substantial photon loss in near-infrared (NIR) region and relatively large photovoltage deficit need to be improved to enable their uses in high-performance solar cells. To mitigate these disadvantages, low-bandgap organic bulk-heterojunction (BHJ) layer into inverted PSCs to construct facile hybrid solar cells (HSCs) is integrated. By optimizing the BHJ components, an excellent power conversion efficiency (PCE) of 23.80%, with a decent open-circuit voltage (V_oc) of 1.146 V and extended photoresponse over 950 nm for rigid HSCs is achieved. The resultant devices also exhibit superior long-term (over 1000 h) ambient- and photostability compared to those from single-component PSCs and OSCs. More importantly, a champion PCE of 21.73% and excellent mechanical durability can also be achieved in flexible HSCs, which is the highest efficiency reported for flexible solar cells to date. Taking advantage of these impressive device performances, flexible HSCs into a power source for wearable sensors to demonstrate real-time temperature monitoring are successfully integrated.

Original language	English
Article number	2105539
Journal	Advanced Materials
Volume	33
Issue number	51
Early online date	3 Oct 2021
DOIs	https://doi.org/10.1002/adma.202105539
Publication status	Published - 23 Dec 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 Wiley-VCH GmbH

Funding

S.F.W., Z.L., and J.Z. contributed equally to this work. A.K.‐Y.J. thanks the sponsorship of the Lee Shau‐Kee Chair Professor (Materials Science). This work was supported by the APRC Grant of the City University of Hong Kong (Nos. 9380086 and 9610421), Innovation and Technology Fund (Nos. ITS/497/18FP and GHP/021/18SZ), the US Office of Naval Research (No. N00014‐20‐1‐2191), the General Research Fund (No. 11307621), and the ECS grant (CityU No. 21301319) from the Research Grants Council of Hong Kong, Natural Science Foundation of Guangdong Province (Nos. 2019A1515010761 and 2019A1515011131), Guangdong Major Project of Basic and Applied Basic Research (No. 2019B030302007), Guangdong‐Hong Kong‐Macao joint laboratory of optoelectronic and magnetic functional materials (No. 2019B121205002).

Keywords

flexible
hybrid solar cells
organic bulk heterojunction
perovskite
wearable sensor

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Cite this

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title = "Low-Bandgap Organic Bulk-Heterojunction Enabled Efficient and Flexible Perovskite Solar Cells",

abstract = "Lead halide perovskite and organic solar cells (PSCs and OSCs) are considered as the prime candidates currently for clean energy applications due to their solution and low-temperature processibility. Nevertheless, the substantial photon loss in near-infrared (NIR) region and relatively large photovoltage deficit need to be improved to enable their uses in high-performance solar cells. To mitigate these disadvantages, low-bandgap organic bulk-heterojunction (BHJ) layer into inverted PSCs to construct facile hybrid solar cells (HSCs) is integrated. By optimizing the BHJ components, an excellent power conversion efficiency (PCE) of 23.80%, with a decent open-circuit voltage (Voc) of 1.146 V and extended photoresponse over 950 nm for rigid HSCs is achieved. The resultant devices also exhibit superior long-term (over 1000 h) ambient- and photostability compared to those from single-component PSCs and OSCs. More importantly, a champion PCE of 21.73% and excellent mechanical durability can also be achieved in flexible HSCs, which is the highest efficiency reported for flexible solar cells to date. Taking advantage of these impressive device performances, flexible HSCs into a power source for wearable sensors to demonstrate real-time temperature monitoring are successfully integrated.",

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author = "Shengfan WU and Zhen LI and Jie ZHANG and Xin WU and Xiang DENG and Yiming LIU and Jingkun ZHOU and Chunyi ZHI and Xinge YU and CHOY, {Wallace C.H.} and Zonglong ZHU and JEN, {Alex K.Y.}",

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AU - WU, Shengfan

AU - LI, Zhen

AU - ZHANG, Jie

AU - WU, Xin

AU - DENG, Xiang

AU - LIU, Yiming

AU - ZHOU, Jingkun

AU - ZHI, Chunyi

AU - YU, Xinge

AU - CHOY, Wallace C.H.

AU - ZHU, Zonglong

AU - JEN, Alex K.Y.

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Low-Bandgap Organic Bulk-Heterojunction Enabled Efficient and Flexible Perovskite Solar Cells

Abstract

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Keywords

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