Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201908298
Keywords
conductivity; multijunction; tandem; nanomesh electrodes; perovskite solar cells; transparency
Categories
Funding
- National Natural Science Foundation of China [61975106, 61604090]
- Shaanxi Technical Innovation Guidance Project [2018HJCG-17]
- National Key Research and Development Program of China [2016YFA0202403]
- National University [GK261001009]
- 111 Project [B14041]
- Chinese National 1000-Talents-Plan Program
- [IRT_14R33]
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Multijunction/tandem solar cells have naturally attracted great attention because they are not subject to the Shockley-Queisser limit. Perovskite solar cells are ideal candidates for the top cell in multijunction/tandem devices due to the high power conversion efficiency (PCE) and relatively low voltage loss. Herein, sandwiched gold nanomesh between MoO3 layers is designed as a transparent electrode. The large surface tension of MoO3 effectively improves wettability for gold, resulting in Frank-van der Merwe growth to produce an ultrathin gold nanomesh layer, which guarantees not only excellent conductivity but also great optical transparency, which is particularly important for a multijunction/tandem solar cell. The top MoO3 layer reduces the reflection at the gold layer to further increase light transmission. As a result, the semitransparent perovskite cell shows an 18.3% efficiency, the highest reported for this type of device. When the semitransparent perovskite device is mechanically stacked with a heterojunction silicon solar cell of 23.3% PCE, it yields a combined efficiency of 27.0%, higher than those of both the sub-cells. This breakthrough in elevating the efficiency of semitransparent and multijunction/tandem devices can help to break the Shockley-Queisser limit.
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