期刊
ACS PHOTONICS
卷 4, 期 4, 页码 861-867出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.6b00929
关键词
perovskite solar cells; CIGS solar cells; inverse integration; tandem; serial-parallel configuration
类别
资金
- Spanish MINECO (Severo Ochoa program) [SEV-2015-0522]
- MINECO
- Fondo Europeo de Desarrollo Regional FEDER [MAT2014-52985-R]
- Fundacio Privada Cellex
- CERCA programme from the Generalitat de Catalunya
- Marie Sklodowska Curie fellowship [665667]
- Swiss National Science Foundation (SNF)-NanoTera
- Competence Center for Energy and Mobility (CCEM Connect -PV)
We present a novel monolithic architecture for optimal light harvesting in multijunction thin film solar cells. In the configuration we consider, formed by a perovskite (PVK) cell overlying a CIGS cell, the current extracted from the two different junctions is decoupled by the insertion of a dielectric nonperiodic photonic multilayer structure. This photonic multilayer is designed by an inverse integration approach to confine the incident sunlight above the PVK band gap in the PVK absorber layer, while increasing the transparency for sunlight below the PVK band gap for an efficient coupling into the CIGS bottom cell. To match the maximum power point voltages in a parallel connection of the PVK and CIGS cells, the latter is divided into two subcells by means of a standard three-laser scribing connection. Using realistic parameters for all the layers in the multijunction architecture we predict power conversion efficiencies of 28%. This represents an improvement of 24% and 26% over the best CIGS and PVK single-junction cells, respectively, while at the same time outperforms the corresponding current-matched standard tandem configuration by more than two percentage points.
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