Integrated Ideal-Bandgap Perovskite/Bulk-Heterojunction Solar Cells with Efficiencies > 24

Xianyong Zhou; Luozheng Zhang; Jianwei Yu; Dong Wang; Chang Liu; Shi Chen; Yaru Li; Yan Li; Meiqing Zhang; Yuanjun Peng; Yanqing Tian; Jinsong Huang; Xingzhu Wang; Xugang Guo; Baomin Xu

doi:10.1002/adma.202205809

Integrated Ideal-Bandgap Perovskite/Bulk-Heterojunction Solar Cells with Efficiencies > 24

Adv Mater. 2022 Oct;34(40):e2205809. doi: 10.1002/adma.202205809. Epub 2022 Sep 1.

Authors

Xianyong Zhou^{1

2

3

4}, Luozheng Zhang^{1

2

3

4

5}, Jianwei Yu¹, Dong Wang¹, Chang Liu^{1

2

3

4

5}, Shi Chen^{1

2

3

4

5}, Yaru Li^{1

2

3

4

5}, Yan Li^{1

2

3

4}, Meiqing Zhang⁶, Yuanjun Peng⁷, Yanqing Tian¹, Jinsong Huang^{8

9}, Xingzhu Wang^{1

2

3

4

5

7}, Xugang Guo¹, Baomin Xu^{1

2

3

4}

Affiliations

¹ Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
² Shenzhen Engineering Research and Development Center for Flexible Solar Cells, Southern University of Science and Technology, Shenzhen, 518055, China.
³ Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology), Ministry of Education, Shenzhen, 518055, China.
⁴ Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Southern University of Science and Technology, Shenzhen, 518055, China.
⁵ SUSTech Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen, 518055, China.
⁶ School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
⁷ Shenzhen Putai Technology Co., Ltd., Longhua District, Shenzhen, 518000, China.
⁸ Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
⁹ Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA.

PMID: 35982543
DOI: 10.1002/adma.202205809

Abstract

Here, the authors report a highly efficient integrated ideal-bandgap perovskite/bulk-heterojunction solar cell (IPBSC) with an inverted architecture, featuring a near infrared (NIR) polymer DTBTI-based bulk-heterojunction (BHJ) layer atop guanidinium bromide (GABr)-modified FA_0.7 MA_0.3 Pb_0.7 Sn_0.3 I₃ perovskite film as the photoactive layer. The IPBSC shows cascade-like energy level alignment between the charge-extractionlayer/perovskite/BHJ and efficient passivation effect of BHJ on perovskite. Thanks to the well-matched energy level alignment and high-quality ideal bandgap-based perovskite film, an efficient charge transfer occurs between the charge-extraction-layer/perovskite/BHJ. Moreover, the NIR polymer DTBTI on the perovskite film leads to an improved NIR light response for the IPBSC. In addition, the O, S and N atoms in the DTBTI polymer yield a strong interaction with perovskite, which is conducive to reducing the defects of the perovskite and suppressing charge recombination. As a result, the solar cell achieves a power conversion efficiency (PCE) of 24.27% (certificated value at 23.4% with 0.283-volt voltage loss), currently the recorded efficiency for both IPBSCs and Pb-Sn alloyed PSCs, and which is over the highest efficiency of perovskite-organic tandem solar cell. Moreover, the thermal, humidity and long-term operational stabilities of the IPBSCs are also significantly improved compared with the control PSCs.

Keywords: energy level alignment; integrated perovskite/bulk-heterojunction solar cells; near-infrared polymers; optical absorption; power conversion efficiency.

Abstract

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