Transfer printing technique with stretchable thin film solar cell for portable power source

Jiyoon Nam^a, Sungjin Jo^a, Youngjoo Lee^b, Dongho Kim^b

^aSchool of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu, Republic of Korea, 702-701, Korea, Republic of

^bAdvanced Functional Thin Films Department, Korea Institute of Material Science, Changwon, Republic of Korea, 641-831, Korea, Republic of

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Jiyoon Nam, 316
Publication date: 5th February 2015

Wearable electronics has been considered as an attractive alternative to replace traditional portable electronic devices. Though considerable progress has been made in recent years, the lack of suitable power sources is a major bottleneck in the development of wearable devices. To overcome these technical barriers, various kinds of energy storage and conversion devices, such as thin film batteries, piezoelectric nanogenerators, supercapacitors, biofuel cells and solar cells have been reported. Among them, solar cells hold the highest promise because of relatively high energy density and no need of frequent recharging. Flexible solar cells have already been developed for applications in portable electronics. However, these flexible solar cells do not meet the requirements of portable power source in wearable applications because flexible devices are not capable of large strains during bending and conformal integration onto non-planar surfaces with complex and curvilinear shapes. In order to overcome this significant challenge, recently stretchable devices have been demonstrated and shown extensive application possibilities in wearable electronics. In this report, we demonstrate stretchable thin film solar cells with serpentine interconnections to minimize strains during mechanical deformations. To fabricate the stretchable thin film solar cells, water soluble sacrificial layer was deposited on the glass substrate. Thin film solar cell layers were then deposited using plasma-enhanced chemical vapor deposition (PECVD). By etching sacrificial layer, thin film solar cell layers were separated from glass substrate and then transfer printed onto prestrained stretchable substrate. By releasing the prestrain, the interconnecting bridges were lifted vertically off the substrate while solar cell layers still attached to the stretchable substrate because of chemical bonding. These popped-up bridges which are connected to each solar cell can reduce large strains during mechanical deformations. As a result, the characteristics of stretchable thin film solar cell are not significantly changed after stretching of the substrate with applied strains of 50%.

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International Conference on Hybrid and Organic Photovoltaics

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

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