Gradated Mixed Hole Transport Layer in a Perovskite Solar Cell: Improving Moisture Stability and Efficiency
SCIE
SCOPUS
- Title
- Gradated Mixed Hole Transport Layer in a Perovskite Solar Cell: Improving Moisture Stability and Efficiency
- Authors
- Kim, Guan-Woo; Kang, Gyeongho; Byranvand, Mahdi Malekshahi; Lee, Gang-Young; Park, Taiho
- Date Issued
- 2017-08
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We demonstrate a simple and facile way to improve the efficiency and moisture stability of perovskite solar cells using commercially available hole transport materials, 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD) and poly(3-hexylthiophene) (P3HT). The hole transport layer (HTL) composed of mixed spiro-OMeTAD and P3HT exhibited favorable vertical phase separation. The hydrophobic P3HT was more distributed near the surface (the air atmosphere), whereas the hydrophilic spiro-OMeTAD was more distributed near the perovskite layer. This vertical separation resulted in improved moisture stability by effectively blocking moisture in air. In addition, the optimized composition of spiro-OMeTAD and P3HT improved the efficiency of the solar cells by enabling fast intramolecular charge transport. In addition, a suitable energy level alignment facilitated charge transfer. A device fabricated using the mixed HTL exhibited enhanced performance, demonstrating 18.9% power conversion efficiency and improved moisture stability.
- Keywords
- ORGANOMETAL HALIDE PEROVSKITES; HIGHLY EFFICIENT; PHASE-SEPARATION; LITHIUM-SALTS; PERFORMANCE; DEGRADATION; POLYMER; FILMS; OXIDE; BLEND
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/92068
- DOI
- 10.1021/acsami.7b07071
- ISSN
- 1944-8244
- Article Type
- Article
- Citation
- ACS APPLIED MATERIALS & INTERFACES, vol. 9, no. 33, page. 27720 - 27726, 2017-08
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- There are no files associated with this item.
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