High-Mobility p-Type Organic Semiconducting Interlayer Enhancing Efficiency and Stability of Perovskite Solar Cells.

Mingyu Zhang,Jiayu Wang,Huanping Zhou,Liang Li,Guanhaojie Zheng,Meng Qin,Xiaowei Zhan,Kuan Liu

doi:10.1002/advs.201700025

Abstract

A high‐mobility p‐type organic semiconductor based on benzodithiophene and diketopyrrolopyrrole with linear alkylthio substituents (BDTS‐2DPP) is used as a dual function interfacial layer to modify the interface of perovskite/2,2′,7,7′‐tetrakis(N,N′‐di‐p‐methoxyphenylamine)‐9,9′‐spirobifluorene in planar perovskite solar cells. The BDTS‐2DPP layer can remarkably passivate the surface defects of perovskite through the formation of Lewis adduct between the under‐coordinated Pb atoms in perovskite and S atoms in BDTS‐2DPP, and also shows efficient hole extraction and transfer properties. The devices with BDTS‐2DPP interlayer show a peak power conversion efficiency of 18.2%, which is higher than that of reference devices without the BDTS‐2DPP interlayer (16.9%). Moreover, the hydrophobic BDTS‐2DPP interlayer effectively protects the perovskite against moisture, leading to enhanced device stability.

Highlights

A high-mobility p-type organic semiconductor based on benzodithioand efficiency, various interfacial matephene and diketopyrrolopyrrole with linear alkylthio substituents (BDTS2DPP) is used as a dual function interfacial layer to modify the interface of perovskite/2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′spirobifluorene in planar perovskite solar cells
We demonstrate the first example for p-type using perovskite as light absorber in photovoltaic cells,[2] organic semiconductors used as the interlayer at perovstremendous progress has been made on PSCs with a certi- kite/HTL interface (BDTS-2DPP) in conventional PSCs to fied power conversion efficiency (PCE) exceeding 20%.[3]
It should be noted that the samples for Fourier transform infrared (FTIR) and Raman spectra measurements were prepared at room temperature, indicating that the passivation of perovskite by BDTS-2DPP is still efficient without thermal treatment

Summary

Introduction

A high-mobility p-type organic semiconductor based on benzodithioand efficiency, various interfacial matephene and diketopyrrolopyrrole with linear alkylthio substituents (BDTS2DPP) is used as a dual function interfacial layer to modify the interface of perovskite/2,2′,7,7′-tetrakis(N,N′-di-p-methoxyphenylamine)-9,9′spirobifluorene in planar perovskite solar cells. BDTS-2DPP interlayer effectively protects the perovskite against moisture, containing nitrogen or sulfur atoms are leading to enhanced device stability.

Results

Conclusion