Naslov
Nanostructured electron transport layers in PSC

Autori
Panžić, Ivana ; Kojić, Vedran ; Mangalam, Jimmy ; Rath, Thomas ; Mandić, Vilko ; Trimmel, Gregor ; Gajović, Andreja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Aerogels processing, modelling and environmental- driven applications

Mjesto i datum
Coimbra, Portugal, 21.10.2019. - 23.10.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Podatak o recenziji nije dostupan

Ključne riječi
perovskite solar cells ; ZnO ; nanorods ; TEM

Sažetak
In perovskite solar cells (PSC), high photovoltaic performance is governed by the extent of electron mobility. For electron transport material (ETM), TiO2 films have been widely accepted. Having similar electron band structure and physical properties to TiO2, ZnO is a viable low- temperature alternative, especially as it can be easily solution-processed in variety of nanostructured morphologies. However, the issues of surface charge recombination and the limited thermal stability of the perovskite layer deposited on ZnO hinder the highest PCE values of ZnO-based PSC. In this work, the role of the type and morphology of the ETM layer on the PSC performance was investigated. The devices were prepared using three different types of ETM configuration: 1) ordered ZnO nanorod films, 2) mesoporous TiO2 films, and 3) ordered ZnO nanorod films with TiO2 passivation layer. ZnO nanorods were grown using self-ordering two stage wet chemistry reaction at elevated temperature. Alternatively, sol-gel derived TiO2 and subsequent thermal treatment were used to deposit mesoporous TiO2 film or to passivate ZnO nanorods. The nanostructured ETM was interfaced by photoactive perovskites, where thermal treatment and subsequent deposition of spiro-MeOTAD and evaporation of Au followed. J/V measurements show the photovoltaic performance of the TiO2-based PSC devices surpasses that of ZnO-based. Even though the nanorod morphology yields higher specific surface area and facilitates the charge transfer, the PSC fail to increase PCE on behalf of the high charge recombination in 1D ZnO nanostructures. However, ZnO in combination with TiO2 and methylammonium iodide (MAI)-free perovskite solutions showed a significantly lower rate of hysteresis. The TiO2 shell can improve the contact between ETM and perovskite layer, and ZnO/TiO2 nanorod arrays with a suitable length can improve the infiltration of perovskite and consequently the quality of the deposited perovskite film.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo

POVEZANOST RADA