Novel silane additive and mixed antisolvent processes for air-fabricated perovskite solar cells with magnetron-sputtered silver contacts

Eze, Martin ORCID: https://orcid.org/0000-0003-2724-7516 2023. Novel silane additive and mixed antisolvent processes for air-fabricated perovskite solar cells with magnetron-sputtered silver contacts. PhD Thesis, Cardiff University. Item availability restricted.

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Abstract

A systematic investigation was conducted on the effect of sputtering power, argon flow rate, sputtering duration, and argon pressure on the performance of the perovskite solar cells (PSCs) with sputtered silver (Ag) contacts. The results show that PSCs prepared in the air at high relative humidity (RH) achieved a high power conversion efficiency (PCE) of 18.35%. The devices also exhibit an excellent short-current density of 22.56 mA/cm2, an open-circuit voltage of 1.10 V and a fill factor of 73.7%. Furthermore, this study demonstrates that depositing metal contacts using magnetron sputtering with optimised parameters could be valuable in preparing highly efficient PSCs. An investigation was also conducted on the effect of a novel chlorodimethyl(pentafluorophenyl)silane (CPFS) additive on the performance of PSCs prepared in the air at high RH. The results reveal that PSCs modified with 3 µl of CPFS additive achieved a PCE of 17.82% compared to 18.07% obtained for control devices. Furthermore, the stability study shows that the devices modified with 3 µl of CPFS additive exhibit degradation in PCE of 23% after 1035 hours of storage, compared to 33% degradation achieved for the control devices. This study proves that PSCs with improved stability could be prepared in the air at high RH using CPFS additive process. A study was conducted on how treating perovskite films with a mixture of methyl ethanoate and trichloromethane antisolvents affects the PCE and stability of PSCs prepared at high relative humidity. The results show that PCE increased from 17.1% for the devices treated with methyl ethanoate (100%) to 18.6% for those treated with a mixture of methyl ethanoate (70%) and trichloromethane (30%). The stability study shows that the PCE of devices treated with methyl ethanoate (85%) mixed with trichloromethane (15%) degraded by 7% after 552 hours of storage. Conversely, PSCs treated with methyl ethanoate (100%) suffered a PCE degradation of 22% after the same period. This study demonstrates that preparing devices using a suitable mixture of methyl ethanoate and trichloromethane antisolvent improves the PCE and stability of air-fabricated PSCs

Item Type:	Thesis (PhD)
Date Type:	Completion
Status:	Unpublished
Schools:	Engineering
Uncontrolled Keywords:	1) Perovskite solar cells 2) Magnetron sputtering 3) Mixed antisolvents 4) Air-fabricated Perovskite solar cells 5) Silane additive 6) Magnetron-sputtered silver contacts
Date of First Compliant Deposit:	24 August 2023
Last Modified:	25 Aug 2023 08:14
URI:	https://orca.cardiff.ac.uk/id/eprint/162019

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