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Isomeric diammonium passivation for perovskite–organic tandem solar cells
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Isomeric diammonium passivation for perovskite–organic tandem solar cells
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Journal Article
Isomeric diammonium passivation for perovskite–organic tandem solar cells
2024
Overview
In recent years, perovskite has been widely adopted in series-connected monolithic tandem solar cells (TSCs) to overcome the Shockley–Queisser limit of single-junction solar cells. Perovskite–organic TSCs, comprising a wide-bandgap (WBG) perovskite solar cell (pero-SC) as the front cell and a narrow-bandgap organic solar cell (OSC) as the rear cell, have recently drawn attention owing to the good stability and potential high power conversion efficiency (PCE)
1
–
4
. However, WBG pero-SCs usually exhibit higher voltage losses than regular pero-SCs, which limits the performance of TSCs
5
,
6
. One of the main obstacles comes from interfacial recombination at the perovskite–C
60
interface, and it is important to develop effective surface passivation strategies to pursue higher PCE of perovskite–organic TSCs
7
. Here we exploit a new surface passivator cyclohexane 1,4-diammonium diiodide (CyDAI
2
), which naturally contains two isomeric structures with ammonium groups on the same or opposite sides of the hexane ring (denoted as
cis
-CyDAI
2
and
trans
-CyDAI
2
, respectively), and the two isomers demonstrate completely different surface interaction behaviours. The
cis
-CyDAI
2
passivation treatment reduces the quasi-Fermi-level splitting–open circuit voltage (
V
oc
) mismatch of the WBG pero-SCs with a bandgap of 1.88 eV and enhanced its
V
oc
to 1.36 V. Combining the
cis
-CyDAI
2
-treated perovskite and the organic active layer with a narrow bandgap of 1.27 eV, the constructed monolithic perovskite–organic TSC demonstrates a PCE of 26.4% (certified as 25.7%).
A new surface passivator cyclohexane 1,4-diammonium diiodide naturally contains two isomeric structures with ammonium groups on the same or opposite sides of the hexane ring, and the two isomers demonstrate completely different surface interaction behaviours.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
