Correlation between Boron–Silicon Bonding Coordination, Oxygen Complexes and Electrical Properties for n-Type c-Si Solar Cell Applications

Cheolmin Park, Gyeongbae Shim, Nagarajan Balaji, Jinjoo Park and Junsin Yi
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Cheolmin Park: Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
Gyeongbae Shim: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea
Nagarajan Balaji: Department of Energy Science, Sungkyunkwan University, Suwon 16419, Korea
Jinjoo Park: Major of Energy and Applied Chemistry, Division of Energy & Optical Technology Convergence, Cheongju University 298, Daeseong-ro, Chungcheongbuk-do, Cheongwon-gu, Cheongju-si 28503, Korea
Junsin Yi: College of Information and Communication Engineering, Sungkyunkwan University, Suwon 16419, Korea

Energies, 2020, vol. 13, issue 12, 1-10

Abstract: In this paper, the relationship between coordination complexes and electrical properties according to the bonding structure of boron and silicon was analyzed to optimize the p–n junction quality for high-efficiency n-type crystalline solar cells. The p + emitter layer was formed using boron tribromide (BBr 3 ). The etch-back process was carried out with HF-HNO 3 -CH 3 COOH solution to vary the sheet resistance (R sheet ). The correlation between boron–silicon bonding in coordination complexes and electrical properties according to the R sheet was analyzed. Changes in the boron coordination complex and boron–oxygen (B–O) bonding in the p + diffused layer were measured through X-ray photoelectron spectroscopy (XPS). The correlation between electrical properties, such as minority carrier lifetime (τ eff ), implied open-circuit voltage (iV oc ) and saturation current density (J 0 ), according to the change in element bonding, was analyzed. For the interstitial defect, the boron ratio was over 1.8 and the iV oc exceeded 660 mV. Additional gains of 670 and 680 mV were obtained for the passivation layer AlO x /SiN x stack and SiO 2 /SiN x stack, respectively. The blue response of the optimized p + was analyzed through spectral response measurements. The optimized solar cell parameters were incorporated into the TCAD tool, and the loss analysis was studied by varying the key parameters to improve the conversion efficiency over 23%.

Keywords: boron tribromide (BBr 3 ); bonding coordination complex; boron-diffused layer; n-type c-Si solar cell (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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