δ‐Phase Management of FAPbBr3 for Semitransparent Solar Cells

Formamidinium lead bromide (FAPbBr3) perovskite owing to suitable wide band gap has promising application in the fields of semitransparent and tandem solar cells. However, the effect of photoinactive δ phase (δ‐FAPbBr3) on the film and device properties is still unclear and rarely investigated. In t...

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Bibliographic Details
Published in:Advanced optical materials 2023-05, Vol.11 (10), p.n/a
Main Authors: Zhu, Helong, Wu, Wenping, Wu, Yanjie, Zhang, Dezhong, Zhan, Hongmei, Cheng, Yanxiang, Wang, Lixiang, Qin, Chuanjiang
Format: Article
Language:English
Subjects:
Bulk density
Carrier density
Carrier transport
Crystal defects
defect passivation
Energy conversion efficiency
FAPbBr 3 solar cells
Materials science
Optics
Perovskites
Phosphine oxide
Phosphonates
Photovoltaic cells
semitransparent
Solar cells
δ‐phase
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Summary:Formamidinium lead bromide (FAPbBr3) perovskite owing to suitable wide band gap has promising application in the fields of semitransparent and tandem solar cells. However, the effect of photoinactive δ phase (δ‐FAPbBr3) on the film and device properties is still unclear and rarely investigated. In this work, the authors find that the growth of δ‐FAPbBr3 has a strong relationship with the property of the underlayer. On the hydrophilic underlayer, crystalline δ‐FAPbBr3 is uniformly distributed in the bulk of the α‐FAPbBr3 film, which has a lower defect density and better carrier transport. A power conversion efficiency of 9.12% is achieved by the management of δ‐FAPbBr3 and using a phosphonate/phosphine oxide dyad additive, which is the highest value among the inverted FAPbBr3‐based perovskite solar cells (PSCs). Moreover, the light utilization efficiency of a semitransparent device reaches 3.15%. This work provides new insights and methods for the realization of high‐performance FAPbBr3‐based PSCs. On the hydrophilic underlayer, δ phase of formamidinium lead bromide (δ‐FAPbBr3) crystals have a uniform distribution, resulting in better carrier transport and lower defect density. FAPbBr3 solar cell with power conversion efficiency of 9.12% and semitransparent solar cell with light utilization efficiency of 3.14% are realized by management of δ‐FAPbBr3 and using phosphonate/phosphine oxide dyad additive.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202202827