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Title: Strategies for high performance perovskite/crystalline silicon four-terminal tandem solar cells
Authors: Ren, Z 
Zhou, J
Zhang, Y 
Ng, A 
Shen, Q 
Cheung, SH
Shen, H
Li, K 
Zheng, Z 
So, SK
Djurišić, AB
Surya, C 
Keywords: Biomimicking elastomeric petals
Oxygen annealing
Tandem solar cells
Transparent electrodes
Issue Date: 2018
Publisher: North-Holland
Source: Solar energy materials and solar cells, 2018, v. 179, p. 36-44 How to cite?
Journal: Solar energy materials and solar cells 
Abstract: In this work, we report systematic studies on improving the optical and electrical properties of four-terminal perovskite/c-Si tandem solar cells. Light harvesting power of the device is significantly enhanced due to the complementary absorption spectra of the perovskite and c-Si absorber materials. To obtain high power conversion efficiency (PCE) for the device, careful engineering of optoelectronic properties of the devices are accomplished through: 1. Oxygen annealing treatment for reducing defect density of perovskite materials; 2. Optical engineering of the transparent electrode (MoO3/Au/MoO3) to obtain high transmission at long wavelengths for the tandem solar cell applications; and 3. Enhancement of light harvesting power achieved by using the novel biomimicking elastomeric petals as the light trapping layer. The individual perovskite solar cell (PSC) with MoO3/Au/MoO3 electrode with or without light trapping layer yields an average PCE of 16.6% and 16.0% respectively. By combining c-Si bottom cell with perovskite top cell mechanically, an overall PCE of 22.4% is achieved for the averaged value, which is a promising result for future development of perovskite based tandem solar cells.
ISSN: 0927-0248
DOI: 10.1016/j.solmat.2018.01.004
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