Fabrication of 25.1% Efficient Hetero Junction Back Contact Si Solar Cells by Mass-Production Process

Okamoto, Chikao; Koide, Naoki; Sugiyama, S.; Takaba, Yoshiroh; Higashikawa, Makoto; Ohnishi, T.; Kobayashi, Masamichi; Nishimura, Yuki; Higo, Teruaki; Ishii, Masahito; Suganuma, Rihito; Mori, Takeshi; Matsumoto, Yuta; Fujiwara, Natsuko; Machida, T.; Horinaka, Hajime

doi:10.1109/pvsc.2018.8548266

Cited by 2 publications

(1 citation statement)

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“…One of the main challenges in the fabrication of IBC crystalline silicon solar cells is to reduce the production cost while preserving high conversion efficiency. There are several reports that amorphous/crystalline silicon heterojunction solar cells with IBC structure show high cell efficiency exceeding 25%; [2][3][4] the current world record is 26.6% (designated area: 179.7 cm 2 ). 5,6) Novel concepts have also been applied to high-efficiency IBC crystalline silicon solar cells, such as polycrystalline silicon on oxide (POLO), ion implantation technique, and tunnel oxide passivating contacts (TopCon).…”

Section: Introductionmentioning

confidence: 99%

Investigation of electrical shading loss of bifacial interdigitated-back-contact (IBC) crystalline silicon solar cells with screen-printed electrode

Tachibana¹,

Shirasawa²,

Takato³

2020

Jpn. J. Appl. Phys.

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N-type bifacial interdigitated-back-contact (IBC) crystalline silicon solar cells were processed with screen-printed electrodes. The bifacial IBC cells resulted in a drastic decrease of the electrical shading loss at the finger region with decreasing pitch on the rear side. This loss was dominated by the width of the base region. In addition, passivation properties also affected carrier recombination in the base region. A narrower base region and smaller pitch led to higher internal quantum efficiency and low series resistance. Cell efficiency of over 22% was obtained for the bifacial IBC crystalline silicon solar cells with a base region width of 250 μm and pitch of 1250 μm. The IQE values above the emitter and base region at medium wavelengths were over 95% and 90%, respectively. Using these cells, a mini-module showing 19.4% module efficiency with 78.1% FF was created.

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