UCSBが高性能太陽電池の低エネルギープロセスを開発(UCSB pioneers a low-energy process for high-performance solar cells)

2024-05-07

2024-05-06 カリフォルニア大学サンタバーバラ校(UCSB)

カリフォルニア大学サンタバーバラ校の研究者が、室温で高品質のペロブスカイト膜を製造する新方法を開発しました。この革新は製造過程を簡素化し、材料の効率を20％未満から24.4％に向上させました。ペロブスカイトは軽量で柔軟性があり、スプレーかインクのように印刷が可能です。新しい製造法は標準的な製造プロセスとも適合し、全体のエネルギー使用を減らすことでCO2排出も低減します。また、この方法で製造されたペロブスカイト太陽電池は、室温処理されたデバイスで以前の限界だった20％を超える24.4％の効率を達成しました。

＜関連情報＞

室温処理ペロブスカイト太陽電池、効率24％を突破 Room-temperature-processed perovskite solar cells surpassing 24% efficiency

Ahra Yi,Sangmin Chae,Hoang Mai Luong,…,Do-Hyung Kim,Hyo Jung Kim,Thuc-Quyen Nguyen
Joule Published:May 06, 2024
DOI:https://doi.org/10.1016/j.joule.2024.04.002

Highlights

•Stable and efficient perovskite phase conversion at room temperature (RT)

•Achieving an efficiency of 24.4% at RT, surpassing the previous efficiency limit

•Defect suppression with vertical growth, resulting in superior performance and stability

•Demonstration of high-quality perovskite films on heat-vulnerable leaf substrates

Summary

The growing demand for renewable energy has spotlighted photovoltaics (PVs), particularly perovskite solar cells (PSCs). However, current processes for manufacturing PSCs rely on high-temperature annealing and intricate post-treatments, thereby limiting their applicability. To address this challenge, we introduce a simple approach to produce high-quality perovskite films at room temperature (RT) by precisely regulating the perovskite composition (Cs_x(FA_0.92MA_0.08)_1−xPb(I_0.92Br_0.08)₃) with the addition of an organic linker (oleylamine, OAm). This method enabled phase conversion to the stable α-phase without thermal annealing, as confirmed by in situ X-ray monitoring. The optimized Cs_10+OAm device achieved impressive efficiencies of 23.2% (24.4% with an anti-reflective coating), surpassing efficiencies attained by previous room/low-temperature-processed PSCs. Additionally, we demonstrated the feasibility of fabricating perovskite films on unconventional substrates (natural leaves), showcasing the potential for versatile applications. These findings offer insights into stabilizing the perovskite structure at RT, promising advances in PV technology and sustainable light energy utilization.