Realization of a low-cost, high-conversion-efficiency solar cell by radial heterogeneous P-N junction of PEDOT:PSS/Si nanostructures

陳冠妤

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Realization of a low-cost, high-conversion-efficiency solar cell by radial heterogeneous P-N junction of PEDOT:PSS/Si nanostructures

利用PEDOT:PSS/矽奈米結構徑向異質P-N接面來實現低成本、高轉換效率太陽能電池

陳冠妤 , Masters　　Advisor：嚴大任　　

英文

徑向異質接面太陽能電池；矽奈米結構；金屬輔助化學蝕刻； KOH蝕刻；有機物PEDOT:PSS ；溶液旋塗法； radial heterogeneous solar cell ； silicon nanostructures ； metal-assisted chemical etching ； KOH etching ； PEDOT:PSS ； solution spin-coating method

Abstract │ Reference (41) │ Altmetrics

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Recently, with further intensified energy crisis and consciousness of environmental protection, solar energy has caught much attention due to its non-polluting and highly abundant properties. However, an efficiency-to-cost ratio of photovoltaic techniques is still too low to substitute for fossil energy. Therefore, developing a cost-effective or high-efficient solar device has aroused many interests and become a must in the field of energy harvesting. Here, a potential candidate that combines a silicon substrate with a polymer layer as a heterojunction solar cell will be elaborated.
    In this study, a Si nanostructure/poly(3,4-ethylenedioxythiophene): poly(stylenesulfonate) (PEDOT:PSS) heterojunction solar cell is proposed and examined. First, different lengths of Si nanowire (SiNW) structures formed by metal-assisted chemical etching (MaCE) were fabricated to discuss a trade-off between light absorption efficiency and amounts of e--h+ recombination centers at surface defects. A solar device with 200 nm SiNWs possesses relatively low reflectance and less trapping defects, resulting in the best performance among the designed lengths of the NWs. 
    Nonetheless, PEDOT:PSS cannot fully infiltrate into 200-nm-length SiNWs. Moreover, without passivation of PEDOT:PSS, there appear lots of surface defects at the bottom region of SiNWs. Hence, a step of post-KOH dipping is executed after the MaCE process to widen the spacing among SiNWs. Several lengths of SiNWs were used as starting substrates and devices with 150-nm-long nanostructures owned the best performance for both the starting substrates with the 200- and 300-nm-long SiNWs that might stem from suppressed surface recombination and also reduced contact resistance, benefiting from a better coverage of PEDOT:PSS on the surface of SiNWs.
    Moreover, influences from PEDOT:PSS as a hole transport layer are also discussed. In principle, the mobility of PEDOT:PSS (~10-2 cm2V-1S-1 for pristine film) is much smaller than Si’s (~103 cm2V-1S-1); thus, there exists a recombination region at the interface between Si and PEDOT:PSS due to the unbalanced mobility between an electron and a hole. Hence, in order to escalate the mobility of PEDOT:PSS, secondary dopants such as dimethyl sulfoxide (DMSO) and graphene oxide (GO) were mixed into PEDOT:PSS and a solar device based on the modified PEDOT:PSS of 0.2 wt% GO addition provided the best mobility and thus the best efficiency.
    Such Si nanostructure/PEDOT:PSS heterojunction solar cell could be simply fabricated via low temperature wet etching and spin-coating methods that can dramatically reduce fabrication cost. After optimizing the Si nanostructures and the amount of the secondary dopants, power conversion efficiency above 13% can be achieved and is believed to be ready for applications of energy harvesting.

Reference ( 41 ) 〈TOP〉

1. Ruiyuan, L. and S. Baoquan, Silicon-based Organic/inorganic Hybrid Solar Cells. ACTA CHIMICA SINICA, 2015. 73(3): p. 225-236.
連結：
2. Huang, J.-H., et al., Controlled Growth of Nanofiber Network Hole Collection Layers with Pore Structure for Polymer− Fullerene Solar Cells. The Journal of Physical Chemistry C, 2008. 112(48): p. 19125-19130.
連結：
3. Zhang, F., T. Song, and B. Sun, Conjugated polymer–silicon nanowire array hybrid Schottky diode for solar cell application. Nanotechnology, 2012. 23(19): p. 194006.
連結：
4. Gong, X., et al., Hybrid tapered silicon nanowire/PEDOT: PSS solar cells. RSC Advances, 2015. 5(14): p. 10310-10317.
連結：
5. Kayes, B.M., H.A. Atwater, and N.S. Lewis, Comparison of the device physics principles of planar and radial pn junction nanorod solar cells. Journal of applied physics, 2005. 97(11): p. 114302.
連結：

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