Efficient organometal trihalide perovskite planar-heterojunction solar cells on flexible polymer substrates

Abstract

Organometal trihalide perovskite solar cells offer the promise of a low-cost easily manufacturable solar technology, compatible with large-scale low-temperature solution processing. Within 1 year of development, solar-to-electric power-conversion efficiencies have risen to over 15%, and further imminent improvements are expected. Here we show that this technology can be successfully made compatible with electron acceptor and donor materials generally used in organic photovoltaics. We demonstrate that a single thin film of the lowtemperature solution-processed organometal trihalide perovskite absorber CH 3 NH 3 PbI 3-x Cl x , sandwiched between organic contacts can exhibit devices with power-conversion efficiency of up to 10% on glass substrates and over 6% on flexible polymer substrates. This work represents an important step forward, as it removes most barriers to adoption of the perovskite technology by the organic photovoltaic community, and can thus utilize the extensive existing knowledge of hybrid interfaces for further device improvements and flexible processing platforms.

Recent Progress on the Long‐Term Stability of Perovskite Solar Cells

“…They are ideal candidates as efficient ETLs because of their low‐temperature fabrication, suitable energy level alignment, and decent electron mobility 102, 120, 122. Unfortunately, they possess the low electron mobility and photochemical instability 123.…”

Efficient and Air‐Stable Mixed‐Cation Lead Mixed‐Halide Perovskite Solar Cells with n‐Doped Organic Electron Extraction Layers

“…[21] Organic charge collection layers, such as fullerenes, have been shown to enable highly effective electron extraction when interfaced with the perovskite absorbers [22][23][24] and reduce UV-induced degradation of the solar cell in comparison with devices employing inorganic TiO 2 . [22] The use of organic layers also facilitates fabricating the entire solar cell at low temperatures (no need for the high temperature sintering step required to obtain highly crystalline metal oxide layers), suitable for processing involving temperature sensitive substrates, including flexible plastic foil and for silicon solar cells.…”

“…We observe highly efficient quenching of the PL in the steady-state PL spectra of perovskite films coated on C 60 , indicating fast electron transfer from perovskite to C 60 , which is consistent with our previous studies. [23,24] When coating the perovskite films upon 1 wt% N-DPBI doped C 60 films, the PL emission of the perovskite film is even more significantly quenched. For the TRPL decays, we observe a significantly faster PL decay for the films coated upon 1 wt% N-DPBI doped C 60 .…”

Origin and elimination of photocurrent hysteresis by fullerene passivation in CH3NH3PbI3 planar heterojunction solar cells

“…O rganometal trihalide perovskites (OTPs) have recently drawn tremendous research interest as they have demonstrated increased power conversion efficiency (PCE; above 15%) in o5 years of research [1][2][3][4][5][6][7][8][9] . One of the most attractive features of OTP materials is their ability to form very good polycrystals through low-temperature solution processes [10][11][12] .…”