Simple-Structured Low-Cost Dopant-Free Hole-Transporting Polymers for High-Stability CsPbI2Br Perovskite Solar Cells
- Authors
- Jeong, WonJo; Ha, Su Ryong; Jang, Ji Won; Jeong, Moon-Ki; Hussain, MD. Waseem; Ahn, Hyungju; Choi, Hyosung; Jung, In Hwan
- Issue Date
- Mar-2022
- Publisher
- American Chemical Society
- Keywords
- perovskite solar cells; CsPbI2Br; dopant-free hole-transporting materials; low cost; long-term stability
- Citation
- ACS Applied Materials and Interfaces, v.14, no.11, pp.13400 - 13409
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS Applied Materials and Interfaces
- Volume
- 14
- Number
- 11
- Start Page
- 13400
- End Page
- 13409
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/139285
- DOI
- 10.1021/acsami.2c01216
- ISSN
- 1944-8244
- Abstract
- Among the solution-processed devices, perovskite solar cells (PSCs) exhibit the highest power conversion efficiency (PCE) of over 25%; tremendous efforts are being undertaken to improve their stability. Recently, all-inorganic CsPbI2Br-based PSCs were reported to exhibit a significantly improved device stability, with a promising PCE of up to 16.79%. In this study, we report stable all-inorganic PSCs by incorporating novel dopant-free hole-transporting materials (HTMs). The synthesis strategy of the newly synthesized polymeric HTMs was similar to that of 2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenylamine)-9,9′-spirobifluorene (spiro-OMeTAD), with the exception that they were designed to exhibit dopant-free characteristics. In particular, their polymeric backbone structure was significantly simpler than that of spiro-OMeTADs, and they were easily synthesized in two steps from commercially available chemicals, with an overall yield of ∼50%. The cost of synthesis at the laboratory scale was calculated to be at least 2.4 times cheaper than that of spiro-OMeTADs. The PCE of dopant-free HTM-based PSCs was 11.01%, which is 1.5 times higher than that of the dopant-free spiro-OMeTAD-based devices (7.52%) and comparable to that of the doped spiro-OMeTAD-based devices (12.22%). Notably, the stability of the device based on our dopant-free HTM to atmospheric oxygen and moisture as well as heat and light irradiation was superior to that of devices based on doped and dopant-free spiro-OMeTAD HTMs. On consideration of the synthesis cost, device efficiency, and device stability, our dopant-free HTM is highly promising for all-inorganic PSCs.
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