High efficiency Cu₂ZnSnS₄ solar cells over FTO substrates and their CZTS/CdS interface passivation <i>via</i> thermal evaporation of Al₂O₃

Solar Cells using Congruent Thermal Evaporation

Although highly valuable as an R&D tool, ALD is a rather slow and thus expensive fabrication method for growing fi lms on the order of 1 μm thick, posing a challenge to industrial scaleup. Hence, there is a need to transfer learnings from ALD to higher-throughput manufacturing techniques without compromising quality. We fi rst demonstrate the ease of phase purifi cation of commercial SnS powder...

High-efficiency robust perovskite solar cells on ultrathin flexible substrates

Wide applications of personal consumer electronics have triggered tremendous need for portable power sources featuring light-weight and mechanical flexibility. Perovskite solar cells offer a compelling combination of low-cost and high device performance. Here we demonstrate high-performance planar heterojunction perovskite solar cells constructed on highly flexible and ultrathin silver-mesh/con...

High-efficiency heterojunction solar cells on crystalline germanium substrates

Making Record-efficiency SnS Solar Cells by Thermal Evaporation and Atomic Layer Deposition.

Tin sulfide (SnS) is a candidate absorber material for Earth-abundant, non-toxic solar cells. SnS offers easy phase control and rapid growth by congruent thermal evaporation, and it absorbs visible light strongly. However, for a long time the record power conversion efficiency of SnS solar cells remained below 2%. Recently we demonstrated new certified record efficiencies of 4.36% using SnS dep...

High-efficiency, microscale GaN light-emitting diodes and their thermal properties on unusual substrates.

A method for forming efficient, ultrathin GaN light-emitting diodes (LEDs) and for their assembly onto foreign substances is reported. The LEDs have lateral dimensions ranging from ~1 mm × 1 mm to ~25 μm × 25 μm. Quantitative experimental and theoretical studies show the benefits of small device geometry on thermal management, for both continuous and pulsed-mode operation, the latter of which s...