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Solliance Partners Make 28.7 Percent Efficient Tandem PVs

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18.6 percent efficient perovskite solar cell can deliver power conversion efficiencies up to 28.7 percent in four terminal tandem configuration

Solliance partners TNO, imec/EnergyVille and the Eindhoven University of Technology, realised a 18.6 percent efficient near-infrared transparent perovskite solar cell. When combined in a four terminal tandem configuration with an efficient Panasonic crystalline silicon (c-Si) cell or with a Miasolé flexible CIGS cell, delivers new record power conversion efficiencies of 28.7 percent and 27.0 percent, respectively.

Tandem technology offers a viable and attractive route to increase the efficiency of commercial solar cells and modules. Four terminal tandems allow to build on experience and practices already available in the industry. In addition, four terminal perovskite/c-Si tandems can be applied broadly and are, for example, very beneficial in combination with bifacial c-Si solar cells which, depending on the actual albedo, can readily achieve a total power generation density as high as 320 W/m².

For this breakthrough, the expertises in perovskite solar cell processing and performance optimisation of Solliance partners TNO, imec/EnergyVille and TU/e were combined to develop an efficient and highly near infrared transparent perovskite solar cell with an efficiency of 18.6 percent.

This perovskite solar cell was combined with different architectures of bottom solar cells and even with different cell technologies, which demonstrates the wide applicability of the 4-terminal tandem approach. There were four results: with a prototype c-Si Interdigitated Back Contact (IBC) Silicon Hetero Junction (SHJ) cell of Panasonic, a record tandem efficiency of 28.7 percent was obtained; with a commercial c-Si Metal Wrap Through (MWT) SHJ cell of Choshu Industry and Co, developed by TNO, a tandem efficiency of 28.2 percent was obtained; with a commercial c-Si Passivated Emitter and Rear Contact (PERC) cell of Solarlab Aiko Europe GmbH, a tandem efficiency of 27.7 percent was achieved; andwith a band gap optimised flexible CIGS cell of MiaSolé, a record tandem efficiency of 27.0 percent was realised.

All of these results are more than 1.5 percent absolute efficiency improvements of earlier records obtained within the Solliance collaboration.

The lab scale perovskite solar cell has a size of 9 mm2. The performance measurement of the four terminal tandem was carried out according to a generally accepted procedure (J. Werner et al. ACS Energy Letters, vol. 1, pp. 474, 2016).

“This performance was achieved by tuning the opto-electrical properties of the perovskite solar cell to better match the optical properties of the bottom cell.” says Dong Zhang of TNO/Solliance. “Next, we determined the loss factors in the four terminal configuration and minimised these step by step,” Zhang continues. “Finally, we optimised the light management of the complete tandem device, in other words, we maximised light absorption in the tandem solar cell.”

“These excellent results form the basis for the next phase in the development, which includes upscaling of the area and the processes.”, says Mehrdad Najafi of TNO/Solliance. “Currently, low-cost upscaling processes for large area modules and maintaining the same performance are being developed by the Solliance partners TNO and imec/EnergyVille.”, concludes Najafi.

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