Department of Solid State Electronics, Vilnius University , Sauletekio 9, Vilnius 10222, Lithuania.
Abengoa Research , Abengoa, C/Energía Solar no 1, Campus Palmas Altas, Sevilla 41014, Spain.
J Am Chem Soc. 2015 Dec 30;137(51):16172-8. doi: 10.1021/jacs.5b11076. Epub 2015 Dec 14.
Four center symmetrical star-shaped hole transporting materials (HTMs) comprising planar triazatruxene core and electron-rich methoxy-engineered side arms have been synthesized and successfully employed in (FAPbI3)0.85(MAPbBr3)0.15 perovskite solar cells. These HTMs are obtained from relatively cheap starting materials by adopting facile preparation procedure, without using expensive and complicated purification techniques. Developed compounds have suitable highest occupied molecular orbitals (HOMO) with respect to the valence band level of the perovskite, and time-resolved photoluminescence indicates that hole injection from the valence band of perovskite into the HOMO of triazatruxene-based HTMs is relatively more efficient as compared to that of well-studied spiro-OMeTAD. Remarkable power conversion efficiency over 18% was achieved using 5,10,15-trihexyl-3,8,13-tris(4-methoxyphenyl)-10,15-dihydro-5H-diindolo[3,2-a:3',2'-c]carbazole (KR131) with compositive perovskite absorber. This result demonstrates triazatruxene-based compounds as a new class of HTM for the fabrication of highly efficient perovskite solar cells.
四种中心对称的星形空穴传输材料（HTMs）由平面三嗪并三唑核心和富电子甲氧基工程侧臂组成，已被合成并成功应用于（FAPbI3）0.85（MAPbBr3）0.15 钙钛矿太阳能电池。这些 HTMs 是由相对廉价的起始材料通过采用简单的制备程序获得的，而无需使用昂贵且复杂的纯化技术。所开发的化合物具有合适的最高占据分子轨道（HOMO），相对于钙钛矿的价带能级，而时间分辨光致发光表明，与经过充分研究的 spiro-OMeTAD 相比，空穴从钙钛矿的价带注入到基于三嗪并三唑的 HTMs 的 HOMO 更为有效。使用 5,10,15-三己基-3,8,13-三（4-甲氧基苯基）-10,15-二氢-5H-二吲哚并[3,2-a：3'，2'-c]咔唑（KR131）与复合钙钛矿吸收剂，实现了超过 18%的显著功率转换效率。该结果表明，基于三嗪并三唑的化合物是用于制造高效钙钛矿太阳能电池的新型 HTM 类。
