Improving the efficiency and stability of tin-based perovskite solar cells using anilinium hypophosphite additive

Tin (Sn) is a potential replacement for lead in organic-inorganic perovskite solar cell (PVSC) technology due to the attractive optoelectronic properties of Sn-perovskites. However, the poor stability of Sn 2+ ions is still the main hindrance for achieving highly stable and efficient Sn-based PVSCs....

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Bibliographic Details
Published in:New journal of chemistry 2021-05, Vol.45 (18), p.892-81
Main Authors: Obila, Jorim Okoth, Lei, Hongwei, Ayieta, Elijah Omolo, Ogacho, Alex Awuor, Aduda, Bernard O, Wang, Feng
Format: Article
Language:English
Subjects:
Absorbers
Energy conversion efficiency
Glove boxes
Open circuit voltage
Optoelectronics
Perovskites
Phase separation
Photovoltaic cells
Solar cells
Stability
Tin
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Summary:Tin (Sn) is a potential replacement for lead in organic-inorganic perovskite solar cell (PVSC) technology due to the attractive optoelectronic properties of Sn-perovskites. However, the poor stability of Sn 2+ ions is still the main hindrance for achieving highly stable and efficient Sn-based PVSCs. In this work, anilinium hypophosphite (AHP) is introduced as a co-additive into a Sn-absorber perovskite precursor containing the tin fluoride (SnF 2 ) additive. The incorporation of the AHP additive not only prohibits the phase separation of SnF 2 but also passivates the perovskite films and finally results in absorbers with superior structural and optoelectronic properties. The underlying reason is related to the formation of a double-salt complex (Sn(H 2 PO 2 ) 2 ·SnF 2 ) through the interaction between AHP and SnF 2 . The high quality of the absorber film induced by AHP delivers an improved device power conversion efficiency (PCE) with a higher open-circuit voltage than those without the AHP additive. More importantly, the device with the AHP additive can retain up to 97% of its PCE after 30 days of storage in a glovebox. We demonstrate that anilinium hypophosphite can improve the performance and stability of Sn-perovskite solar cells.
ISSN:1144-0546
1369-9261
1369-9261
DOI:10.1039/d1nj00602a