Laboratoire de Photonique et Interfaces, Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne, Switzerland.
J Am Chem Soc. 2012 Oct 24;134(42):17396-9. doi: 10.1021/ja307789s. Epub 2012 Oct 11.
We report for the first time on a hole conductor-free mesoscopic methylammonium lead iodide (CH(3)NH(3)PbI(3)) perovskite/TiO(2) heterojunction solar cell, produced by deposition of perovskite nanoparticles from a solution of CH(3)NH(3)I and PbI(2) in γ-butyrolactone on a 400 nm thick film of TiO(2) (anatase) nanosheets exposing (001) facets. A gold film was evaporated on top of the CH(3)NH(3)PbI(3) as a back contact. Importantly, the CH(3)NH(3)PbI(3) nanoparticles assume here simultaneously the roles of both light harvester and hole conductor, rendering superfluous the use of an additional hole transporting material. The simple mesoscopic CH(3)NH(3)PbI(3)/TiO(2) heterojunction solar cell shows impressive photovoltaic performance, with short-circuit photocurrent J(sc)= 16.1 mA/cm(2), open-circuit photovoltage V(oc) = 0.631 V, and a fill factor FF = 0.57, corresponding to a light to electric power conversion efficiency (PCE) of 5.5% under standard AM 1.5 solar light of 1000 W/m(2) intensity. At a lower light intensity of 100W/m(2), a PCE of 7.3% was measured. The advent of such simple solution-processed mesoscopic heterojunction solar cells paves the way to realize low-cost, high-efficiency solar cells.
我们首次报道了一种无空穴传输体的介观甲脒碘化铅（CH(3)NH(3)PbI(3)）钙钛矿/TiO(2) 异质结太阳能电池，该电池通过将 CH(3)NH(3)I 和 PbI(2)在 γ-丁内酯中的溶液沉积在 400nm 厚的 TiO(2)（锐钛矿）纳米片上制得，这些纳米片暴露（001）面。在 CH(3)NH(3)PbI(3)上蒸镀金膜作为背接触。重要的是，CH(3)NH(3)PbI(3)纳米颗粒在这里同时充当光收集器和空穴传输体的角色，使得不需要使用额外的空穴传输材料。简单的介观 CH(3)NH(3)PbI(3)/TiO(2) 异质结太阳能电池表现出令人印象深刻的光伏性能，短路光电流 J(sc)=16.1mA/cm(2)，开路光电压 V(oc)=0.631V，填充因子 FF=0.57，在 1000W/m(2)强度的标准 AM 1.5 太阳光下，光电转换效率（PCE）为 5.5%。在 100W/m(2)的较低光强下，测量到的 PCE 为 7.3%。这种简单的溶液处理介观异质结太阳能电池的出现为实现低成本、高效率的太阳能电池铺平了道路。
