The extension of the light absorption of photovoltaics into the near-infrared region is important to increase the energy conversion efficiency. Although the progress of the lead halide perovskite solar cells is remarkable, and high conversion efficiency of >20% has been reached, their absorption limit on the long-wavelength side is ~800 nm. To further enhance the conversion efficiency of perovskite-based photovoltaics, a hybridized system with near-infrared photovoltaics is a useful approach. Here we report a panchromatic sensitizer, coded DX3, that exhibits a broad response into the near-infrared, up to ~1100 nm, and a photocurrent density exceeding 30 mA cm^-2 in simulated air mass 1.5 standard solar radiation. Using the DX3-based dye-sensitized solar cell in conjunction with a perovskite cell that harvests visible light, the hybridized mesoscopic photovoltaics achieved a conversion efficiency of 21.5% using a system of spectral splitting.

Nature Communications 6, Article number: 8834 doi:10.1038/ncomms9834
Received 14 August 2015 Accepted 08 October 2015 Published 05 November 2015

http://www.nature.com/ncomms/2015/151105/ncomms9834/full/ncomms9834.html

将太阳能电池的吸收光谱拓展至近红外区域对于提升电池效率是十分重要的。尽管卤化铅钙钛矿太阳能电池的发展非常迅猛，效率已经超过 20% ，但是其吸收光谱在长波长范围只能达到 800nm 。为了进一步提升钙钛矿太阳能电池的能量转化效率，可以在电池中加入近红外吸收部分。 Kinoshita 等人报道了一种全光谱敏化剂（编号： DX3 ），它的吸收边可以达到接近 1100nm 处。在 1.5 个标准太阳光照下，其电流值可以超过 30mAcm^-2 。基于 DX3 和钙钛矿材料的杂化太阳能电池可以达到 21.5% 的能量转化效率。（新材料在线整理）