TY  - JOUR
AU  - Li, Shenghao
AU  - Pomaska, Manuel
AU  - Lambertz, Andreas
AU  - Duan, Weiyuan
AU  - Bittkau, Karsten
AU  - Qiu, Depeng
AU  - Yao, Zhirong
AU  - Luysberg, Martina
AU  - Steuter, Paul
AU  - Köhler, Malte
AU  - Qiu, Kaifu
AU  - Hong, Ruijiang
AU  - Shen, Hui
AU  - Finger, Friedhelm
AU  - Kirchartz, Thomas
AU  - Rau, Uwe
AU  - Ding, Kaining
TI  - Transparent-conductive-oxide-free front contacts for high-efficiency silicon heterojunction solar cells
JO  - Joule
VL  - 5
IS  - 6
SN  - 2542-4351
CY  - [Cambridge, Mass.]
PB  - Cell Press
M1  - FZJ-2021-03729
SP  - 1535 - 1547
PY  - 2021
AB  - In order to compensate the insufficient conductance of heterojunction thin films, transparent conductive oxides (TCO) have been used for decades in both sides of contacted crystalline silicon heterojunction (SHJ) solar cells to provide lateral conduction for carrier collection. In this work, we substitute the TCO layers by utilizing the lateral conduction of c-Si absorber, thereby enabling a TCO-free design for SHJ solar cells achieving a low series resistivity of 0.32 Ucm2 and a good fill factor of 80.7% with a conventional finger pitch of 1.8 mm. Achieving high efficiencies in TCO-free SHJ solar cells requires suppressing deterioration of the passivation quality induced by the direct metal-to-a-Si:H contacts. We show that an ozone treatment at the a-Si:H/metal interface suppresses the metal diffusion into the a-Si:H layer and improves the passivation without increasing the contact resistivity. SHJ solar cells with TCO-free front contacts and ozone treatment achieve efficiencies of >22%.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000663028600018
DO  - DOI:10.1016/j.joule.2021.04.004
UR  - https://juser.fz-juelich.de/record/897320
ER  -