Journal
MATERIALS ADVANCES
Volume 4, Issue 7, Pages 1777-1784Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ma01089e
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Perovskite solar cells (PSCs) can be made semitransparent for wider applications. The commonly used sputtered transparent conductive oxide (TCO) electrodes in semitransparent PSCs have lower power-conversion efficiencies (PCEs) than opaque devices due to the deposition process. To improve performance, a multi-layer buffer consisting of ZnO/BCP/Ag was designed and used instead of a single ZnO layer buffer. This modification significantly increased the PCE and fill factor (FF) of the semitransparent PSC.
Perovskite solar cells (PSCs) can be made semitransparent (ST) for more widespread applications, such as solar-powered vehicles, building-integrated photovoltaics (BIPV) and tandem devices. The most common ST-PSCs use sputtered transparent conductive oxides (TCO) as electrodes, and their power-conversion efficiencies (PCEs) lag behind those of opaque devices due to the detrimental deposition process of the transparent electrodes. In most cases, to reduce the sputtering damage, a metal oxide buffer layer is deposited before sputtering to protect the organic carrier-transport layer. Theoretically, compared with an individual buffer, a multi-layer buffer can be more helpful in performance improvement. Here, we designed a ZnO/BCP/Ag multi-layer buffer with an improved performance compared with the single ZnO layer buffer. By replacing the single-layer ZnO with the ZnO/BCP/Ag multi-layer buffer, the PCE of ST-PSC was improved from 7.88% to 16.14%, and the fill factor (FF) increased from 37.42% to 67.46%. After adding a metal frame for carrier collection, a small-area ST-PSC achieved an optimal PCE of 17.95%. By combining this ST-PSC with a silicon solar cell, a four-terminal perovskite/silicon tandem cell with a PCE of 26.18% was obtained.
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