Amorphous/crystalline silicon heterojunction is the most attractive technique to obtain high efficiency solar cells. The emitter of these cells is usually covered by Transparent Conductive Oxides (TCO) that ensures lateral conductivity and Anti Reflection Coating (ARC). Then the cell front side is completed by a metal grid, made by screen printed silver, sintered at temperature below 200°C. Both the TCO and the grid strongly influence the cell series resistance as well as the cell efficiency. The choice of TCO needs to be tuned in order to ensurethe lowest sheet resistance and an appropriate workfunction to fit the emitter requirements. Consequentlythe front screen printed grid needs to be optimized to produce the lowest specific contactresistance with the underneath TCO. In this work we show the results obtained developing an innovative low temperature curing, polymeric based, screen printable silver paste. High linear conductivity, low specific contact resistivity and strong adhesion to TCO have been reached. Specific contact resistivity as low as 0.15mΩcm2 and printed Ag bulk resistivity of 20µΩcm have been reached on TCO film having sheet resistance in the range between 40 and 200 Ω/sq.
IInnovative Low Temperature Sintering, High Adhesion, Low Contact Resistance Screen Printable Silver Paste for a-Si:H/c-Si Heterojunctions / Serenelli, L.; Tucci, M.; Izzi, M.; Miliciani, M.; Caputo, Domenico; DE CESARE, Giampiero. - STAMPA. - (2014), pp. 1399-1402. (Intervento presentato al convegno 29th European Photovoltaic Solar Energy Conference tenutosi a Amsterdam, Niederlande nel 22 -26 Sep 2014) [10.4229/EUPVSEC20142014-2CV.4.46].
IInnovative Low Temperature Sintering, High Adhesion, Low Contact Resistance Screen Printable Silver Paste for a-Si:H/c-Si Heterojunctions
CAPUTO, Domenico;DE CESARE, Giampiero
2014
Abstract
Amorphous/crystalline silicon heterojunction is the most attractive technique to obtain high efficiency solar cells. The emitter of these cells is usually covered by Transparent Conductive Oxides (TCO) that ensures lateral conductivity and Anti Reflection Coating (ARC). Then the cell front side is completed by a metal grid, made by screen printed silver, sintered at temperature below 200°C. Both the TCO and the grid strongly influence the cell series resistance as well as the cell efficiency. The choice of TCO needs to be tuned in order to ensurethe lowest sheet resistance and an appropriate workfunction to fit the emitter requirements. Consequentlythe front screen printed grid needs to be optimized to produce the lowest specific contactresistance with the underneath TCO. In this work we show the results obtained developing an innovative low temperature curing, polymeric based, screen printable silver paste. High linear conductivity, low specific contact resistivity and strong adhesion to TCO have been reached. Specific contact resistivity as low as 0.15mΩcm2 and printed Ag bulk resistivity of 20µΩcm have been reached on TCO film having sheet resistance in the range between 40 and 200 Ω/sq.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
