Modified P3HT materials as hole transport layers for flexible perovskite solar cells

JOURNAL OF POWER SOURCES

卷:494

Article

De Rossi, Francesca¹  Renno, Giacomo²  Taheri, Babak¹  Nia, Narges Yaghoobi¹  Ilieva, Viktoria²  Fin, Andrea³  Di Carlo, Aldo^1,4  Bonomo, Matteo^2,5,6  Barolo, Claudia^2,5,6  Brunetti, Francesca¹ 

[1] Univ Roma Tor Vergata, Dept Elect Engn, CHOSE, Via Politecn 1, I-00133 Rome, Italy

[2] Univ Torino, Dept Chem, Via Pietro Giuria 7, I-10125 Turin, Italy

[3] Univ Torino, Dept Sci & Drug Technol, Via Pietro Giuria 9, I-10125 Turin, Italy

[4] CNR ISM Ist Struttura Mat, Via Fosso del Cavaliere 100, I-00133 Rome, Italy

[5] Univ Torino, NIS Interdept Ctr, Via Pietro Giuria 7, I-10125 Turin, Italy

[6] Univ Torino, INSTM Reference Ctr, Via Pietro Giuria 7, I-10125 Turin, Italy

关键词: Perovskite solar cells;    Hole transporting material;    Polymers;    P3HT;    Module;    Stability;   

DOI  :  10.1016/j.jpowsour.2021.229735

来源: Elsevier

【 摘 要 】

Flexible perovskite solar cells (f-PSCs) are light-weight, conformal and thus ideal for seamless integration of photovoltaics onto wearable and portable electronics. Nevertheless, the spread of f-PSCs is limited by both the lower efficiency compared to rigid counterparts and the employment of costly materials. Among them, holetransporting materials (HTM) represent the most expensive component and also a weak spot for long-term stability, due to poor resistance against heat and moisture. Here, we propose poly-3-hexylthiophene (P3HT)modified HTMs embodying benzothiadiazole (BTD) moieties as electron-poor host. BTD is inserted along P3HT backbone, creating a donor-acceptor system able to promote the charge mobility throughout the HTM. A first series of copolymers, synthetized by Stille coupling, shows a decrease of benzothiadiazole/thiophene ratio (1:2, 1:4, 1:6), allowing to modulate both electronic and optical properties. Additionally, a greener approach (Kumada polycondensation) is employed to synthetize a homologous copolymer (VI-LM-027) embodying a lower amount of BTD that, used as HTM in f-PSCs, leads to power conversion efficiency comparable to commercially available P3HT and shows improved stability under continuous illumination. Finally, VI-LM-027 is also employed in 6 ? 6 cm2 modules, delivering 6.9% efficiency on 16 cm2 of active area and demonstrating the feasibility of the proposed HTMs for large area manufacture.

【 授权许可】

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