Deconstruction HJT

Solar photovoltaic webex: photovoltaic industry chain in recent years, rapid development is the essence of technology-driven authors effect. The current trend of single crystal has been established, P type battery lift effect slow progress, N type battery efficiency improvement potential. Looking forward to the future, we believe that the photovoltaic industry the most anticipated change lies in the link of p-type battery to N type batteries, including heterojunction cell with its high efficiency, authors potential photovoltaic industry the most potential to become the next big wind.

solar cell conversion efficiency can be expressed as the open circuit voltage, short circuit current and fill factor is the product of three parameters. The open circuit voltage depends on the built-in electric field intensity, then ultimately depends on the forbidden band width of material itself. Heterojunction cell forbidden band width of 1. 7 - 1. 9 ev, homogeneity is far higher than silicon section 1 of the battery. 12 ev and heterojunction battery has the high open circuit voltage, thus has the high efficiency of battery.

heterojunction cell step four core technology for cleaning cloth with soft nap, amorphous silicon thin film deposition, conductive film, printing electrode and sintering. And the PERC technology difference is that: 1) Amorphous silicon thin film deposition process, the use of PECVD or RPD deposition technique eigen hydrogenated amorphous silicon layer type and P/N hydrogenated amorphous silicon layer; 2) Using PVD coating link sedimentary TCO conductive film; 3) Using low temperature silver paste printing electrode area is required; 4) Need to control the low temperature sintering sintering process.

the heterojunction battery costs mainly from silicon ( 47%) , slurry ( 24%) , depreciation, 6%) , the target material ( 5%) 。 Specific view: 1) Silicon space mainly from silicon wafer thinning cost reduction, the future thinned 45% space; 2) Paste mainly from reduction and reduction, cost reduction space future reduction were 40%, 30% price cut space space; 3) Depreciation, the unit capacity is 2 times the PERC equipment investment, the future can be reduced to the same as the PERC.

in the component investing HJT is higher than the PERC, but because HJT efficiency is higher, the number of components is less, stents and investment is lower than the PERC inverter and so on the components, finally the total initial investment 10% higher than the PERC. At the same time because of the low efficient failure, whole life cycle of HJT capacity is higher than the PERC, makes the final leveling of both KWH cost is basically the same.

is now mass production or planned production HJT battery nearly 20 enterprises, mostly is still in its pilot stage. Current global planning capacity exceeds 10 gigawatts (gw), the actual capacity of about 2 gw. 2 - planning capacity is expected in the future Three years gradually fall to the ground, HJT industrial chain maturity will increase quickly, so as to promote the equipment and materials prices fall, make HJT economy advantage.

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